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Q.
Find the Odd one out of the given series 6, 15, 35, 77, 165, 221
A.
221
B.
165
C.
35
D.
77
View Answer
Correct choice: D
Explanation:
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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