In given series 1, 2, 6, 15, 31, 56, 91 only one number is incorrect. Find out that wrong number	Options: A) 91 B) 92 C) 90 D) 60 E) 61
1,   1 + 12 = 2,   2 + 22 = 6,   6 + 32 = 15,   15 + 42 = 31,   31 + 52 = 56,   56 + 62 = 92   Last number of given series must be 92 not 91.   91NSWER:91
<result>A</result>
In given series 1, 2, 6, 15, 31, 56, 91 only one number is incorrect. Find out that wrong number