Q81
One term in the number series is wrong. Find out the wrong term. 6, 15, 35, 77, 165, 221
A.
35
B.
77
C.
165
AnswerD.
15
Answer: Option C
Solution
Answer: Option C
Solution:
The terms of the series are products of two consecutive prime numbers i.e. (2 x 3),(3 x 5), (5 x 7), (7 x 11),.....
So, 165 is wrong and must be replaced by (11 x 13) i.e. 143.