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1. One term in the number series is wrong. Find out the wrong term.
6, 15, 35, 77, 165, 221

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.

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