Write the formula to find sum of (n-1) natural numbers of an arithmetic progression
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Step-by-step explanation:
The sum of n terms of AP is thesum(addition) of first n terms of thearithmetic 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 know as common difference, and (n-1), where n isnumbers of terms to be added.
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