Series

SSC CGL · Reasoning · 44 practice questions with answers and explanations: 18 Easy, 14 Medium, 12 Hard.

Sample questions

Sample Easy question 1

Find the missing number: 3, 3, 6, 6, 9, ?, 12

  1. 6
  2. 9
  3. 10
  4. 12
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Answer: B. Each number appears twice before moving to the next multiple of 3: 9, 9, 12 — so the missing term is 9.

Sample Medium question 2

Find the next number: 2, 3, 5, 7, 11, 13, ?

  1. 15
  2. 16
  3. 17
  4. 19
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Answer: C. This is the sequence of prime numbers; the next prime after 13 is 17.

Sample Hard question 3

Find the next number: 2, 5, 14, 41, ?

  1. 120
  2. 122
  3. 124
  4. 128
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Answer: B. Each term follows (previous × 3) - 1: 41 × 3 - 1 = 122.

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