Number Series

J&K Bank PO · 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: 15, 25, 35, 45, 55, 65, ?

  1. 80
  2. 75
  3. 74
  4. 76
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Answer: B. Each term adds 10. So the next term is 75.

Sample Easy question 2

Find the next number in the series: 3, 36, 7, 32, 11, 28, 15, ?

  1. 26
  2. 25
  3. 24
  4. 23
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Answer: C. Two interleaved series: +4 on odd places and −4 on even places. So the next term is 24.

Sample Easy question 3

Find the missing number in the series: 3, 6, 12, ?, 48, 96

  1. 25
  2. 23
  3. 24
  4. 26
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Answer: C. Following the pattern of the series, the missing term is 24.

Sample Medium question 4

Find the wrong number in the series: 6, 14, 22, 30, 42, 46, 54

  1. 42
  2. 46
  3. 14
  4. 54
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Answer: A. Each term should add 8. The term 42 breaks the pattern; it should be 38.

Sample Medium question 5

Find the next number in the series: 12, 16, 18, 22, 24, 28, ?

  1. 39
  2. 33
  3. 35
  4. 34
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Answer: D. The terms are consecutive primes + 5. So the next term is 34.

Sample Medium question 6

Find the missing number in the series: 5, 15, ?, 75, 155, 315

  1. 37
  2. 36
  3. 34
  4. 35
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Answer: D. Following the pattern of the series, the missing term is 35.

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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