Reasoning - Series Completion - Discussion

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Q.

6, 15, 35, 77, 165, 221  .                          
A. 35 B. 77
C. 165 D. 221

Answer: Option C
Explaination:

 


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.




Discussion

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