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Question

If 5, 15, 45, 135, 405, 1215.... are in GP, which series is also in GP? 



Your Answer
A

5, 15, 405

Correct Answer
B

5, 45, 405

Your Answer
C

5, 135, 405

Your Answer
D

5, 15, 135


Solution

The correct option is B

5, 45, 405


When the terms of a Geometric Progression are selected at regular intervals then the new series obtained is also a Geometric Progression. 

e.g: In 5, 45, 405

The common ratio is 9

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