Series Questions for CAT with Answers PDF

In the given series, addition and subtraction take place alternately. The numbers being added are 1.5, 2.5, 3.5, 4.5, while the numbers being subtracted are 3.5, 2.5, 1.5.
3 + 1.5 = 4.5
4.5 - 3.5 = 1
1 + 2.5 = 3.5
3.5 - 2.5 = 1
1 + 3.5 = 4.5
4.5 - 1.5 = 3
3 + 4.5 = 7.5
Thus, the missing number is 1.

The following series follows the pattern of .
 = 142
 = 73
 = 38.5
 = 21.25
Therefore, the correct answer is 38.5.

The given number series is based on the following pattern:

Hence, the wrong number is 6.

The sequence follows the pattern given below. 
2.5 + (1 × 2.5) = 2.5 + 2.5 = 5.0
5.0 + (2 × 2.5) = 5 + 5 = 10.0
10.0 + (3 × 2.5) = 10 + 7.5 = 17.5
17.5 + (4 × 2.5) = 17.5 + 10.0 = 27.5
27.5 + (5 × 2.5) = 27.5 + 12.5 = 40 
Therefore, the missing number is 40.

 The sequence is going as follows.
5 + (3¹ - 2) = 6
6 + (3² - 2) = 13
13 + (3³ - 2) = 38
38 + (3⁴ - 2) = 117
117 + (3⁵ - 2) = 358 
Hence, the missing number is 358.

Since,
41 - 24 = 17
54 - 41 = 13
63 - 54 = 9
68 - 63 = 5
⇒ ? - 68 = 1
⇒ ? = 69

The series is in the following pattern.
13 + 4² - 2 = 27
27 + 5² - 4 = 48
48 + 6² - 6 = 78
78 + 7² - 8 = 119
119 + 8² - 10 = 173
Thus, the missing number is 48.

The pattern is given below:
163 - 29 = 134
134 - 23 = 111
111 - 17 = 94
94 - 11 = 83
83 - 5 = 78
So, 78 is the missing number.
Alternative solution:

The series follows the following pattern:
2 × 1.5 + 2.5 = 5.5
5.5 × 3 + 5 = 21.5
21.5 × 6 + 7.5 = 136.5
136.5 × 12 + 10 = 1648
So, the missing number is 21.5.

The series is mopn/mopn/mopn/mopn. Thus, the pattern 'mopn' is repeated.

324 × (5/6) = 270
270 x (5/6) = 225
225 x (5/6) = 187.5
187.5 x (5/6) = 156.25
So, the sequence is:
324, 270, 225, 187.5, 156.25
Therefore, the missing number is 225.

The given number series is based on the following pattern:

Hence, the wrong number is 75.

The series follows the following pattern:
17 × 2 - 0.5 = 34 - 0.5 = 33.5
33.5 × 4 - 1 = 134 - 1 = 133
133 × 6 - 1.5 = 798 - 1.5 = 796.5
796.5 × 8 - 2 = 6372 - 2 = 6370
So, the missing number is 796.5.

The series follows the following pattern:
1 × 1 + 1 = 2
(2 × 2) + 2 = 6
(6 × 3) + 3 = 21
(21 × 4) + 4 = 88
(88 × 5) + 5 = 440 + 5 = 445
(445 × 6) + 6 = 2670 + 6 = 2676
So, the missing number is 88.

From the given sequence, we notice that
56 × 3 ÷ 2 = 84
84 × 3 ÷ 2 = 126
126 × 3 ÷ 2 = 189
189 × 3 ÷ 2 = 283.5