Question

Find out the wrong number in the given sequence of numbers. 1, 2, 6, 15, 31, 56, 91
A) 31
B) 91
C) 56
D) 15

Answer 1

1, 1 + 12 = 2,
2 + 22 = 6, 6 + 32 = 15,
15 + 42 = 31, 31 + 52 = 56,
56 + 62 = 92
 
                  SO we dint get number 92 so the wrong number was 91