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Trebla

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For b), find the sum of n terms of a GP with first term a and common ratio r. Do the same but with first term a and common ratio r2. Take the ratio of the sums and factor the differences of two squares and it should simplify to the result.
 

Epicman69

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For b), find the sum of n terms of a GP with first term a and common ratio r. Do the same but with first term a and common ratio r2. Take the ratio of the sums and factor the differences of two squares and it should simplify to the result.
I did that but I got r^n + 1 : 1
 

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