formula to be used sum of n-1 of an ap
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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 – 'a' and the product of the difference between second and first term-'d' also known as common difference, and (n-1), where n is numbers of terms to be added.
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it's formula will be n/2(2a+(n-1)d)-n
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