find the wrong number in the series. 1, 2, 6, 15, 31, 56, 91
find the wrong number in the series. 1, 2, 6, 15, 31, 56, 91
Answer: The difference of the two consecutive numbers are 1, 4, 9, 16, 25, 35.
Series: 1^2, 2^2, 3^2, 4^2, 5^2, 6^2
91-56=35\ne36
Wrong number: 91
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