Number Series · Question 24 · Medium

Find the next number in the series: 1, 10, 3, 9, 5, 8, 7, 7, ?

  1. 9
  2. 8
  3. 11
  4. 6
Answer and explanation

Answer: A. 9

Explanation: Two series alternate: 1, 3, 5, 7, ... (odd terms, +2) and 10, 9, 8, 7, ... (even terms, −1). The next term belongs to the first series: 7 + 2 = 9.

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