Multiple choice general knowledge math & puzzles

Find out the wrong number in the given sequence of numbers: 1, 2, 6, 15, 31, 56, 91

  1. 31

  2. 91

  3. 56

  4. 15
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B Correct answer
Explanation

Pattern adds consecutive odd numbers: +1 (2-1), +3 (5-2), +5 (10-5), +7 (17-10), +9 (26-17), +11 (37-26), +13 (50-37). Next should be 50+15=65, but 91 is given. 91 breaks the +15 pattern.

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