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. 56

  3. 91

  4. 15
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C Correct answer
Explanation

The differences are squares: +1, +4, +9, +16, +25. The next difference should be +36. 56 + 36 = 92. Therefore, 91 is the wrong number in the sequence.

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