What is the formula for the sum of the first n terms

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Looking for some explanation on this question, If the first term is a1 and common difference is d , then what is the formula for the sum of the first n terms of a finite Arithmetic series like:

a1 + (a1+d) + (a1+2d) + (a1+3d) + .... , a1+(n-1)d?

Reference no: EM131826287

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