AP Series | How to derive the general formula for finding the sum of n terms of an A.P Sequence

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The sum of n terms of AP is the sum(addition) of first n terms of the arithmetic sequence. It is equal to n divided by 2 times the sum of twice the first term plus the last term.
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GordonMine-isee
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The second term of GP is equal to 8th term of AP. The first tern, common differenc and common ratio are all equal and non_zero. Fine the sum of the first five terms of the GP.

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