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Find the number of terms of a G.P. in wh...

Find the number of terms of a G.P. in which the ratio of the sum of the first eleven terms to the sum of the last eleven terms is 1/8 , and the ratio of the sum of all the terms without the first nine to the sum of all the terms without the last nine is 2.

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In a GP , the ratio of the sum of the first eleven terms of the sum of the last even terms is 1//8 and the ratio of the sum of all the terms without the first nine to the sum of all terms without the last nine is 2 . Then the number of terms in the GP is

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