Answer :

Let there be n terms.


a, ar, ar2, ar3, ……………..arn - 2, arn - 1


The sum of a G.P.


Odd terms of the sequence are:


a, ar2, ar4……………..arn - 2


So sum of this series =



According to the given problem:




r + 1 = 5


r = 4.


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