Reasoning - Series Completion - Discussion

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Q.

In the series 2, 6, 18, 54, ...... what will be the 8th term ?  .                          
A. 4370 B. 4374
C. 7443 D. 7434

Answer: Option B
Explaination:

 


Clearly, 2 x 3 = 6, 6 x 3 = 18, 18 x 3 = 54,.....
So, the series is a G.P. in which a = 2, r = 3.
Therefore 8th term = ar8-1 = ar7 = 2 x 37 = (2 x 2187) = 4374.




Discussion

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