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This mock test of Practice Test: Number Series- 1 for Banking Exams helps you for every Banking Exams entrance exam.
This contains 10 Multiple Choice Questions for Banking Exams Practice Test: Number Series- 1 (mcq) to study with solutions a complete question bank.
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QUESTION: 1

17, 19, 23, 29, 31, 37, _____

Solution:

The given numbers are consecutive prime numbers in increasing order starting with 17. Hence, the next number

in the series is 41.

QUESTION: 2

225, 196, 169, _____, 121, 100, 81

Solution:

The given numbers are squares of consecutive natural numbers in decreasing order starting with 15, i.e., the numbers 225, 196, 169, ____, 100, 81 can be written as

152, 142, 132 , ____, 112 , 102 , 92. Hence, the missing number is 122 , i.e., 144.

QUESTION: 3

54, 66, 82, 102, 126, _____

Solution:

54 + 12, 66 + 16, 82 + 20, 102 + 24, 126, _____. The difference is

increasing by 4, starting with 12. So, the next difference is

24 + 4 = 28. Hence, the next number is 126 + 28

= 154. Choice (d)

QUESTION: 4

97, 83, 73, 67, 59, _____

Solution:

The given numbers are alternate prime numbers in decreasing order, starting with 97.

Hence, the next number in the series is 47.

QUESTION: 5

8, 16, 48, 96, 288, 576, _____

Solution:

8 x 2, 16 x 3, 48 x 2, 96 x 3, 288 x 2, 576, _____

The numbers in the series are alternately being multiplied

by two and three. Hence, the next number in the series is

576 × 3 = 1728.

QUESTION: 6

75, 291, 416, 480, 507, ____

Solution:

75 + 216, 291 + 125, 416 + 64, 480, + 27, 507, ____.

The differences are cubes of consecutive natural numbers in decreasing

order. Hence, the next number in the series in 507 + (2)3 = 515.

QUESTION: 7

225, 224, _____, 222, 221

Solution:

The given numbers are consecutive natural numbers in decreasing order starting with 225. Hence, the missing number is 223.

QUESTION: 8

5, 13, 41, 85, 257, _____

Solution:

- the number at odd digit is multiplied by 2 and 3 is added.
- the number at even places is multiplied by 3 and 2 is added

5 × 2 + 3, 13 × 3 + 2, 41 × 2 + 3, 85 × 3 + 2, 257 × 2 + 3 , _____

The next number in the series is 257 × 2 + 3 = 517.

QUESTION: 9

123 , 129, 141, _________, 159, 165

Solution:

The common difference between consecutive terms is 6, 12, 6, 12 & so on. So, the term next to 141 is 141 + 6 = 147

QUESTION: 10

0, 5, 22, 57, 116, _________

Solution:

The 1st to 5th terms are 0, 5, 22, 57, 116. These terms are 1 – 1, 8 – 3, 27 – 5, 64 – 7, 125 – 9.

So, these are 13 – 1, 23 – 3, 33 – 5, 43 – 7, 53 – 9.

So, the nth term of series is n^{3} – (2n – 1).

So, the 6th term of the series is 63 – (2 × 6 –1) = 216 – 11 = 205.

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