Question

63. Which number is wrong in the series: 1, 2, 6,
15, 31, 56, 91.
(A) 31
(B) 91
(C) 56
(D) 15​

Answer 1

Answer:

answer is 91

Step-by-step explanation:

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

This is clearly , +(12), +(22), +(32), +(42), +(52),+(62)  

Here 35 is wrong, So our wrong number is 91