3, 7, 16, 32, 56, 93, 142

The series is 22, + 32, + 42, + 52, + 62, + 72 . The wrong no. is 56; 32 + 52 = 32 + 25 = 57

Correct Answer: 56

Explanation:

The series is 2², + 3², + 4², + 5², + 6², + 7² .
The wrong no. is 56; 32 + 5² = 32 + 25 = 57

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