Number Series

J&K Bank Banking Associate · Quantitative Aptitude · 61 practice questions with answers and explanations: 37 Easy, 21 Medium, 3 Hard.

Sample questions

Sample Easy question 1

Find the next number in the series: 9, 11, 13, 17, 19, 23, ?

  1. 27
  2. 24
  3. 25
  4. 26
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Answer: C. The terms are consecutive primes + 6. So the next term is 25.

Sample Easy question 2

Find the missing number in the series: 2, 5, ?, 20, 32, 47, 65

  1. 13
  2. 12
  3. 11
  4. 10
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Answer: C. Following the pattern of the series, the missing term is 11.

Sample Easy question 3

Find the next number in the series: 1, 11, 51, 211, 851, ?

  1. 3412
  2. 3411
  3. 3415
  4. 3410
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Answer: B. Each term = previous × 4 + 7. So the next term is 3411.

Sample Medium question 4

Find the wrong number in the series: 26, 33, 40, 47, 54, 64, 68

  1. 68
  2. 40
  3. 64
  4. 33
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Answer: C. Each term should add 7. The term 64 breaks the pattern; it should be 61.

Sample Medium question 5

Find the next number in the series: 10, 14, 16, 20, 22, 26, ?

  1. 33
  2. 34
  3. 31
  4. 32
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Answer: D. The terms are consecutive primes + 3. So the next term is 32.

Sample Medium question 6

Find the missing number in the series: 18, 24, ?, 36, 42, 48, 54

  1. 29
  2. 32
  3. 31
  4. 30
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Answer: D. Following the pattern of the series, the missing term is 30.

Sample Hard question 7

Find the next number in the series: 3, 6, 18, 66, 258, ?

  1. 1026
  2. 1025
  3. 1031
  4. 1027
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Answer: A. Each term = previous × 4 − 6. So the next term is 1026.

Sample Hard question 8

Find the wrong number in the series: 3, 12, 39, 122, 363, 1092

  1. 39
  2. 122
  3. 363
  4. 1092
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Answer: B. Each term should be previous × 3 + 3. The term 122 breaks the pattern; it should be 120.

Sample Hard question 9

Find the next number in the series: 4, 19, 64, 199, 604, ?

  1. 1823
  2. 1818
  3. 1819
  4. 1820
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Answer: C. Each term = previous × 3 + 7. So the next term is 1819.

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