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Question

Show that the products of the corresponding terms of of two G.P.s a,ar,ar2,..........,arn1 and A,AR,AR2,..........,ARn1 from a G.P. and find the common ratio.

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Solution

GP1
a,ar,ar2....arn1

GP2
A,AR,AR2.....ARn1

GP1×GP2
aA,aARr,aAr2R2......aArn1Rn1

Ratio aArRaA=rR & aAr2R2aARr=rR

Common ratio =rR & it is same through the series

It is also a G.P.

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