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

5, 15, 405

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5, 45, 405

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5, 135, 405

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Cannot be determined

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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.

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