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Question

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

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Solution

It has to be proved that the sequence , aA,arAR,ar2AR2,...arn1ARn1, forms a G.P.
Second TermFirst Term=arARaA=rR
Third TermSecond Term=ar2AR2arAR=rR
Thus, the above sequence forms a G.P. with common ratio rR.

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