All questions of Alphabetical and Number Series for Mechanical Engineering Exam
Look at this series: 53, 53, 40, 40, 27, 27, ... What number should come next?- a)12
- b)14
- c)27
- d)53
Correct answer is option 'B'. Can you explain this answer?
a)
12
b)
14
c)
27
d)
53
|
Vikas Choudhury answered |
Explanation:
In this series, each number is repeated, and then 13 is subtracted to arrive at the next number.
The pattern can be described as follows:
● The first number is 53, and it is repeated.
● Then, 13 is subtracted from the first number to get the second number, which is 40.
● The second number is then repeated.
● Again, 13 is subtracted from the second number to get the third number, which is 27.
● The third number is repeated.
● Finally, 13 is subtracted from the third number to get the next number in the series, which is 14.
Therefore, the answer is 14, as it follows the established pattern in the series.
Therefore, the answer is 14, as it follows the established pattern in the series.
You can study more about Number Series through the document:
Look at this series: 3, 4, 7, 8, 11, 12, ... What number should come next?- a)7
- b)10
- c)14
- d)15
Correct answer is option 'D'. Can you explain this answer?
a)
7
b)
10
c)
14
d)
15
|
Alok Verma answered |
This alternating addition series begins with 3; then 1 is added to give 4; then 3 is added to give 7; then 1 is added, and so on.
Look at this series: 7, 10, 8, 11, 9, 12, ... What number should come next?a)7b)10c)12d)13Correct answer is 'B'. Can you explain this answer?
b)10
c)12
d)13
Correct answer is 'B'. Can you explain this answer?
|
Raghavendra Sharma answered |
This is a simple alternating addition and subtraction series. In the first pattern, 3 is added; in the second, 2 is subtracted.
Look at this series: 2, 1, (1/2), (1/4),...so on. What number should come next?
- a)(1/3)
- b)(1/8)
- c)(2/8)
- d)(1/16)
Correct answer is option 'B'. Can you explain this answer?
Look at this series: 2, 1, (1/2), (1/4),...so on. What number should come next?
a)
(1/3)
b)
(1/8)
c)
(2/8)
d)
(1/16)
|
|
Varun Kapoor answered |
This is a simple division series, each number is one-half of the previous number.
In other terms to say, the number is divided by 2 successively to get the next result.
► 4/2 = 2
► 2/2 = 1
► 1/2 = 1/2
► (1/2) / 2 = 1/4
► (1/4) / 2 = 1/8 and so on.
► 2/2 = 1
► 1/2 = 1/2
► (1/2) / 2 = 1/4
► (1/4) / 2 = 1/8 and so on.
Directions to Solve
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Question -
66, 57, 48, ?
- a)36
- b)63
- c)39
- d)92
Correct answer is option 'C'. Can you explain this answer?
Directions to Solve
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Question -
66, 57, 48, ?
a)
36
b)
63
c)
39
d)
92
|
Ishani Rane answered |
66 in this 6+6 = 12
57 in this 5+7 = 12
48 in this 4+8 = 12
39 in this 3+9 = 12
57 in this 5+7 = 12
48 in this 4+8 = 12
39 in this 3+9 = 12
Look at this series: 4, 11, 19, 41, ?, 161... What number should come next?- a)62
- b)79
- c)85
- d)90
Correct answer is option 'B'. Can you explain this answer?
Look at this series: 4, 11, 19, 41, ?, 161... What number should come next?
a)
62
b)
79
c)
85
d)
90
|
Dipika Sarkar answered |
Pattern:
4 × 2 + 3 = 11
11 × 2 – 3 = 19
19 × 2 + 3 = 41
41 × 2 – 3 = 79
79 × 2 + 3 = 161
4 × 2 + 3 = 11
11 × 2 – 3 = 19
19 × 2 + 3 = 41
41 × 2 – 3 = 79
79 × 2 + 3 = 161
Look at this series:4 6 12 30 90 ? 1260What number should come?- a)300
- b)305
- c)315
- d)325
Correct answer is option 'C'. Can you explain this answer?
Look at this series:4 6 12 30 90 ? 1260What number should come?
a)
300
b)
305
c)
315
d)
325
|
Chirag Nair answered |
Logic is 4 × 1.5 = 6, 6 × 2 = 12, 12 × 2.5 = 30, 30 × 3 = 90, 90 × 3.5 = 315, 315 × 4 = 1260.
Look at this series: 8, 22, 8, 28, 8, ... What number should come next?- a)9
- b)29
- c)32
- d)34
Correct answer is option 'D'. Can you explain this answer?
a)
9
b)
29
c)
32
d)
34
|
Bijoy Pillai answered |
This is a simple addition series with a random number, 8, interpolated as every other number. In the series, 6 is added to each number except 8, to arrive at the next number.
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series. Question - 563, 647, 479, 815, ?- a)672
- b)386
- c)279
- d)143
Correct answer is option 'D'. Can you explain this answer?
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
563, 647, 479, 815, ?
a)
672
b)
386
c)
279
d)
143
|
Niti Kulkarni answered |
The pattern is + 84, - 168, + 336,.....i.e. + 84, - (84 x 2), + (84 x 22), .....
So, missing term = 815 - (84 x 23) = 815 - 672 = 143.
Directions to SolveChoose the correct alternative that will continue the same pattern and replace the question mark in the given series.Question - 2,2,5, 13,28,?- a)49
- b)50
- c)51
- d)52
Correct answer is option 'D'. Can you explain this answer?
Directions to Solve
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Question -
2,2,5, 13,28,?
a)
49
b)
50
c)
51
d)
52
|
Disha Banerjee answered |
The pattern is + 0, + 3, + 8, + 15, ..... i.e. + (l2 - 1), + (22 - 1), + (32 - 1), + (42 - 1), .....
So, missing term = 28 + (52 - 1) = 28 + 24 = 52.
Directions to SolveChoose the correct alternative that will continue the same pattern and replace the question mark in the given series.Question - 20, 20, 19, 16, 17, 13, 14, 11, ?, ?- a)10, 10
- b)10, 11
- c)13, 14
- d)13, 16
Correct answer is option 'A'. Can you explain this answer?
Directions to Solve
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Question -
20, 20, 19, 16, 17, 13, 14, 11, ?, ?
a)
10, 10
b)
10, 11
c)
13, 14
d)
13, 16
|
Siddharth Singh answered |
A
Directions to Solve
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Question -
2,3,8,27, 112,?
- a)226
- b)339
- c)452
- d)565
Correct answer is option 'D'. Can you explain this answer?
Directions to Solve
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Question -
2,3,8,27, 112,?
a)
226
b)
339
c)
452
d)
565
|
|
Snehal Nambiar answered |
The pattern is:
(a*1) + 1, (a*2) + 2, (a*3) + 3, (a*4) + 4, (a*5) + 5
So, missing term = 112 x 5 + 5 = 565.
Directions to SolveChoose the correct alternative that will continue the same pattern and replace the question mark in the given series.Question - 0, 2, 8, 14, ?, 34- a)20
- b)23
- c)24.
- d)25
Correct answer is option 'C'. Can you explain this answer?
Directions to Solve
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Question -
0, 2, 8, 14, ?, 34
a)
20
b)
23
c)
24.
d)
25
|
Avantika Basu answered |
The pattern is + 2, + 6, + 6, + 10, + 10,.....
So, missing term = 14 + 10 = 24.
Directions to SolveChoose the correct alternative that will continue the same pattern and replace the question mark in the given series.Question - In the series 3, 9, 15, ...... what will be the 21st term?- a)117
- b)121
- c)123
- d)129
Correct answer is option 'C'. Can you explain this answer?
Directions to Solve
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Question -
In the series 3, 9, 15, ...... what will be the 21st term?
a)
117
b)
121
c)
123
d)
129
|
|
Ankita Dey answered |
Pattern Analysis:
To find the pattern in the given series, we need to observe the difference between consecutive terms.
The difference between the first and second terms is 9 - 3 = 6.
The difference between the second and third terms is 15 - 9 = 6.
From the above observations, we can see that the difference between consecutive terms is constant and equal to 6.
Pattern:
The pattern can be represented as:
3, 9, 15, 21, ...
Finding the 21st Term:
To find the 21st term in the series, we need to determine the value by adding the constant difference to the last term.
The last term in the given series is 15.
Using the pattern, we can find the 21st term as follows:
15 + (6 x 15) = 15 + 90 = 105.
Therefore, the 21st term in the series is 105.
Explanation of Correct Answer:
The correct answer is option 'C' (123).
The given options are:
a) 117
b) 121
c) 123
d) 129
To confirm the correct answer, let's check if the 21st term is 123 by using the pattern.
Starting from the first term (3), we can calculate the terms in the series as follows:
3, 9, 15, 21, 27, 33, 39, 45, 51, 57, 63, 69, 75, 81, 87, 93, 99, 105, 111, 117, 123.
As we can see, the 21st term is indeed 123, which matches option 'C'.
Hence, the correct answer is option 'C' (123).
To find the pattern in the given series, we need to observe the difference between consecutive terms.
The difference between the first and second terms is 9 - 3 = 6.
The difference between the second and third terms is 15 - 9 = 6.
From the above observations, we can see that the difference between consecutive terms is constant and equal to 6.
Pattern:
The pattern can be represented as:
3, 9, 15, 21, ...
Finding the 21st Term:
To find the 21st term in the series, we need to determine the value by adding the constant difference to the last term.
The last term in the given series is 15.
Using the pattern, we can find the 21st term as follows:
15 + (6 x 15) = 15 + 90 = 105.
Therefore, the 21st term in the series is 105.
Explanation of Correct Answer:
The correct answer is option 'C' (123).
The given options are:
a) 117
b) 121
c) 123
d) 129
To confirm the correct answer, let's check if the 21st term is 123 by using the pattern.
Starting from the first term (3), we can calculate the terms in the series as follows:
3, 9, 15, 21, 27, 33, 39, 45, 51, 57, 63, 69, 75, 81, 87, 93, 99, 105, 111, 117, 123.
As we can see, the 21st term is indeed 123, which matches option 'C'.
Hence, the correct answer is option 'C' (123).
Directions to SolveChoose the correct alternative that will continue the same pattern and replace the question mark in the given series.Question - 240, ?, 120, 40, 10, 2- a)180
- b)240
- c)420
- d)480
Correct answer is option 'B'. Can you explain this answer?
Directions to Solve
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Question -
240, ?, 120, 40, 10, 2
a)
180
b)
240
c)
420
d)
480
|
Debanshi Saha answered |
The pattern followed is
240÷1=240
240÷2=120
120÷3=40
40÷4=10
10÷5=2
Hence the number is 240
Directions to SolveChoose the correct alternative that will continue the same pattern and replace the question mark in the given series.Question - 24, 60, 120, 210, ?- a)300
- b)336
- c)420
- d)525
Correct answer is option 'B'. Can you explain this answer?
Directions to Solve
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Question -
24, 60, 120, 210, ?
a)
300
b)
336
c)
420
d)
525
|
Debolina Roy answered |
The pattern is + 36, + 60, + 90,.....i.e. + [6 x (6 + 0)], + [6 x (6 + 4)], + [6 x (6 + 9)],...
So, missing term = 210 + [6 x (6 + 15)] = 210 + 126 = 336.
Directions to SolveChoose the correct alternative that will continue the same pattern and replace the question mark in the given series.Question - 1, 5, 14, 30, 55, 91, ?- a)130
- b)140
- c)150
- d)160
Correct answer is option 'B'. Can you explain this answer?
Directions to Solve
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Question -
1, 5, 14, 30, 55, 91, ?
a)
130
b)
140
c)
150
d)
160
|
Preethi Nair answered |
The pattern is + 4, + 9, + 16, + 25, + 36, ..... i.e. + 22, + 32, + 42, + 52, + 62,.....
So, missing term = 91 + 72 = 91 + 49 = 140.
Directions to Solve Choose the correct alternative that will continue the same pattern and replace the question mark in the given series. Question - 625, 5, 125, 25, 25, ?, 5- a)5
- b)25
- c)125
- d)625
Correct answer is option 'C'. Can you explain this answer?
Directions to Solve
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
625, 5, 125, 25, 25, ?, 5
a)
5
b)
25
c)
125
d)
625
|
|
Ishani Rane answered |
The given sequence is a combination of two series :
I. 625, 125, 25, 5 and II. 5, 25, ?
The pattern in I is / 5, while that in II is x 5. So, missing term = 25 x 5 = 125.
Directions to SolveChoose the correct alternative that will continue the same pattern and replace the question mark in the given series.Question - 13, 35, 57, 79, 911, ?- a)1110
- b)1112
- c)1113
- d)1315
Correct answer is option 'C'. Can you explain this answer?
Directions to Solve
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Question -
13, 35, 57, 79, 911, ?
a)
1110
b)
1112
c)
1113
d)
1315
|
|
Gargi Kulkarni answered |
The terms of the given series are numbers formed by joining together consecutive
odd numbers in order i.e. 1 and 3, 3 and 5, 5 and 7, 7 and 9, 9 and 11, .....
So, missing term = number formed by joining 11 and 13 = 1113.
Directions to Solve
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Question -
2,15,41,80,?
- a)111
- b)120
- c)121
- d)132
Correct answer is option 'D'. Can you explain this answer?
Directions to Solve
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Question -
2,15,41,80,?
a)
111
b)
120
c)
121
d)
132
|
|
Janhavi Nambiar answered |
The pattern is + 13, + 26, + 39,.....
So, missing term = 80 + 52 = 132.
Directions to SolveChoose the correct alternative that will continue the same pattern and replace the question mark in the given series.Question - 1, 4, 10, 22, 46, ?- a)64
- b)86
- c)94
- d)122
Correct answer is option 'C'. Can you explain this answer?
Directions to Solve
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Question -
1, 4, 10, 22, 46, ?
a)
64
b)
86
c)
94
d)
122
|
Nandini Singh answered |
The pattern is + 3, + 6, + 12, + 24,.....
So, missing term = 46 + 48 = 94.
Directions to SolveChoose the correct alternative that will continue the same pattern and replace the question mark in the given series.Question - In the series 10, 17, 24, 31, 38,.....which of the following will be a number of the series ?- a)48
- b)45
- c)574
- d)1003
Correct answer is option 'B'. Can you explain this answer?
Directions to Solve
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Question -
In the series 10, 17, 24, 31, 38,.....which of the following will be a number of the series ?
a)
48
b)
45
c)
574
d)
1003
|
Learnpro Institute answered |
The given series is 10, 17, 24, 31, 38,...
To identify the pattern, let's look at the difference between consecutive terms:
- 17 - 10 = 7
- 24 - 17 = 7
- 31 - 24 = 7
- 38 - 31 = 7
The difference between each consecutive term is consistently 7. Therefore, to find the next number in the series, we add 7 to the last number (38):
38 + 7 = 45
Thus, the next number in the series is 45.
Look at this series: 1, 3, 6, 10, 15...so on. What number should come next?- a)21
- b)22
- c)20
- d)23
Correct answer is option 'A'. Can you explain this answer?
Look at this series: 1, 3, 6, 10, 15...so on. What number should come next?
a)
21
b)
22
c)
20
d)
23
|
EduRev CLAT answered |
It is a triangular number series forming a triangular pattern.
► 1 = 1,
► 1+2 = 3,
► 1+2+3 = 6,
► 1+2+3+4 = 10,
► 1+2+3+4+5 = 15,
► 1+2+3+4+5+6 = 21.
► 1+2 = 3,
► 1+2+3 = 6,
► 1+2+3+4 = 10,
► 1+2+3+4+5 = 15,
► 1+2+3+4+5+6 = 21.
Directions to SolveChoose the correct alternative that will continue the same pattern and replace the question mark in the given series.Question - 1, 9, 25, 49, 81, ?- a)100
- b)112
- c)121
- d)144
Correct answer is option 'C'. Can you explain this answer?
Directions to Solve
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Question -
1, 9, 25, 49, 81, ?
a)
100
b)
112
c)
121
d)
144
|
Srishti Joshi answered |
The series consists of squares of consecutive odd numbers
i.e. 12, 32, 52, 72, 92,.....
So, missing term = 112 = 121.
Directions to SolveChoose the correct alternative that will continue the same pattern and replace the question mark in the given series.Question - 1, 9, 25, 49, ?, 121- a)64
- b)81
- c)91
- d)100
Correct answer is option 'B'. Can you explain this answer?
Directions to Solve
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Question -
1, 9, 25, 49, ?, 121
a)
64
b)
81
c)
91
d)
100
|
|
Debolina Roy answered |
The given series consists of squares of consecutive odd numbers
i.e. 12, 32, 52, 72,.....
So, missing term = 92 = 81.
Directions to SolveChoose the correct alternative that will continue the same pattern and replace the question mark in the given series.Question - 28, 33, 31, 36, ?, 39- a)32
- b)34
- c)38
- d)40
Correct answer is option 'B'. Can you explain this answer?
Directions to Solve
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Question -
28, 33, 31, 36, ?, 39
a)
32
b)
34
c)
38
d)
40
|
|
Preethi Nair answered |
The pattern is + 5, - 2, + 5, - 2,.....
So, missing term = 36 - 2 = 34.
Directions to SolveChoose the correct alternative that will continue the same pattern and replace the question mark in the given series.Question - 6, 17, 39, 72, ?- a)83
- b)94
- c)116
- d)127
Correct answer is option 'C'. Can you explain this answer?
Directions to Solve
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Question -
6, 17, 39, 72, ?
a)
83
b)
94
c)
116
d)
127
|
Mrinalini Basu answered |
The pattern is + 11, + 22, + 33, .....
So, missing term = 72 + 44 = 116.
Directions to Solve Choose the correct alternative that will continue the same pattern and replace the question mark in the given series. Question - 6, 11, 21, 36, 56, ?- a)42
- b)51
- c)81
- d)91
Correct answer is option 'C'. Can you explain this answer?
Directions to Solve
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
6, 11, 21, 36, 56, ?
a)
42
b)
51
c)
81
d)
91
|
|
Amar Chavan answered |
The pattern is + 5, + 10, + 15, + 20, ...
So, missing term = 56 + 25 = 81.
Chapter doubts & questions for Alphabetical and Number Series - RRB JE Mock Test Series for Mechanical Engineering (ME) 2026 2025 is part of Mechanical Engineering exam preparation. The chapters have been prepared according to the Mechanical Engineering exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for Mechanical Engineering 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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