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This mock test of CAT Previous Year Questions: Number Series for Banking Exams helps you for every Banking Exams entrance exam.
This contains 20 Multiple Choice Questions for Banking Exams CAT Previous Year Questions: Number Series (mcq) to study with solutions a complete question bank.
The solved questions answers in this CAT Previous Year Questions: Number Series quiz give you a good mix of easy questions and tough questions. Banking Exams
students definitely take this CAT Previous Year Questions: Number Series exercise for a better result in the exam. You can find other CAT Previous Year Questions: Number Series extra questions,
long questions & short questions for Banking Exams on EduRev as well by searching above.

QUESTION: 1

**Wrong Number Series:**

59, 41, 68, 33, 77, 23

Solution:

Therefore, wrong no. is 33

QUESTION: 2

9, 5, 6, 10.5, 23, 90, 183,

Solution:

The solution is :

9 * .5 + .5 = 5

5 * 1 + 1 = 6

6 * 1.5 + 1.5 = 10.5

10.5 * 2 + 2 = 23

23 * 2.5 + 2.5 = 60 ≠ 90

60 * 3 + 3 = 183

Therefore, wrong no. is 90

QUESTION: 3

318, 168, 78, 38, 18, 8, 3

Solution:

The solution is :

8/2 – 1 = 3

18/2 - 1 = 8

38/2 – 1 = 18

78/2 – 1 = 38

168/2 – 1 = 83 ≠ 78

318/2 -1 = 158 ≠ 168

Therefore, wrong no. is 168

QUESTION: 4

3, 8, 18, 38, 80, 158, 318

Solution:

The solution is:

3 * 2 + 2 = 8

8 * 2 + 2 = 18

18 * 2 + 2 = 38

38 * 2 + 2 = 78 ≠ 80

78 * 2 + 2 = 158

158 * 2 + 2 = 318

Therefore, wrong no. is 80

QUESTION: 5

120, 143, 168, 195, 225, ?

Solution:

(11)*11 – 1 = 120

11*13 = 143

13*13-1 = 168

13*15 = 195

15*15-1=225

15*17=255

Answer is 255 so, none of these.

QUESTION: 6

32, 39, 65, 128, 253, 467

Solution:

Therefore, wrong no. is 253

QUESTION: 7

33, 39, 56, 85, 127, 185, 254

Solution:

Therefore, it must be 42+14 = 56 i.e. 127+56 = 183

56+ 15 = 71 i.e. 183+ 71 = 254

Hence, wrong no. is 185

QUESTION: 8

7, 9, 21, 67, 275, 1371, 8233

Solution:

The solution is :

7 * 1 + 2 = 9

9 * 2 + 3 = 21

21 * 3 + 4 = 67

67 * 4 + 5 = 273 ≠ 275

273 * 5 + 6 = 1371

1371 * 6 + 7 = 8233

Therefore, wrong no. is 275

QUESTION: 9

3, 6, 15, 45, 157, 630, 2835

Solution:

The solution is :

3 * 2 = 6

6 * 2.5 = 15

15 * 3 = 45

45 * 3.5 = 157.5 ≠ 157

157.5 * 4 = 630

630 * 4.5 = 2835

Therefore, wrong no. is 157

QUESTION: 10

5, 23, 43, 66, 94, 131

Solution:

Because, difference of the difference is prime numbers in increasing order . therefore, wrong no. is 131

QUESTION: 11

4, 2, 6, 0, 8, -4, 10

Solution:

Therefore, wrong no. is -4

QUESTION: 12

2478, 819, 257, 84, 24, 5

Solution:

2478/3 – 7 = 819

819/3 – 6 = 267 ≠ 257

267/3 – 5 = 84

84/3 – 4 = 24

24/3 – 3 = 5

Therefore, the wrong no. is 257

QUESTION: 13

3, 11, 34, 69, 131, 223

Solution:

The solution is :

(1)3 + 2 = 3

(2)3 + 3 = 11

(3)3 + 4 = 31 ≠ 34

(4)3 + 5 = 69

(5)3 + 6 = 131

Therefore, the wrong no. is 34

QUESTION: 14

9, 5, 9, 25, 95, 414

Solution:

The solution is :

9 * .5 + .5 = 5

5 * 1.5 + 1.5 = 9

9 * 2.5 + 2.5 = 25

25 * 3.5 + 3.5 = 91 ≠ 95

91 * 4.5 + 4.5 = 414

Therefore wrong no. is 95

QUESTION: 15

8, 18, 64, 272, 1395, 8424, 59045

Solution:

Therefore, wrong no. is 64

QUESTION: 16

47, 44, 45, 46, 33, 57, 3, 88

Solution:

Therefore, wrong no. is 57

QUESTION: 17

1, 8, 66, 460, 2758, 13785, 55146 ** **

Solution:

The solution is :

1 * 9 – 1 = 8

8 * 8 + 2 = 66

66 * 7 - 3 =459 ≠ 460

459 * 6 + 4 = 2758

2758 * 5 – 5 = 13785

13785 * 4 + 6 = 55146

Therefore, wrong no. is 460

QUESTION: 18

3, 7.5, 15, 37.5, 75, 167.5, 375

Solution:

The solution is :

3 * 2.5 = 7.5

15 * 2.5 = 37.5

75 * 2.5 = 187.5 ≠ 167.5

7.5 * 2 = 15

37.5 * 2 = 75

187.5 * 2 = 375

Therefore, wrong no. is 167.5

QUESTION: 19

4, 12, 42, 196, 1005, 6066, 42511

Solution:

The solution is:

4 * 2 + (2)2 = 12

12 * 3 + (3)2 = 45 ≠ 42

45 * 4 + (4)2 = 196

196 * 5 + (5)2 = 1005

1005 * 6 + (6)2 = 6066

6066 * 7 +(7)2 = 2511

Therefore, wrong no. is 42

QUESTION: 20

9, 7, 15, 44, 175, 874

Solution:

The solution is :

9 * 1 – 1 = 8 ≠ 7

8 * 2 – 1 = 15

15 * 3 – 1 = 44

44 * 4 – 1 = 175

175 * 5 – 1 = 874

Therefore, wrong no. is 7

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