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Find the wrong number in the series. 1, 2, 6, 15, 31, 56, 91

Correct Answer: 91

Explanation:

The difference of the two consecutive numbers are 1, 4, 9, 16, 25, 35. 


This is clearly ,  + 1 2 ,   + 2 2 ,   + 3 2 ,   + 4 2 ,   + 5 2 , + 6 2  


Here 35 is wrong, So our wrong number is 91


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