Question

Find out the wrong term in the given series of numbers ?
6, 15, 35, 77, 165, 221
A) 35
B) 165
C) 221
D) 77

Answer 1

Q:

Find out the wrong term in the given series of numbers ?
6, 15, 35, 77, 165, 221

A) 35
B) 165
C) 221
D) 77

Answer:   B) 165 

Explanation:

The given series follow the rule that :
Multiplying consecutive prime numbers
2,3,5,7,11,13,17,19....
2x3 = 6
3x5 = 15
5x7 = 35
7x11 = 77
11x13 = 143
13x17 = 221
So, the wrong term is 165.