Question
In each of the following number series, one term is
wrong. Find the wrong term. 2, 6, 15, 31, 56, 92, 141Solution
Check the differences: 6 - 2 = 4 15 - 6 = 9 31 - 15 = 16 56 - 31 = 25 92 - 56 = 36 141 - 92 = 49 These are consecutive square numbers: 2^2, 3^2, 4^2, 5^2, 6^2, 7^2 So actually this series is correct as given.
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