What is the sum of first n terms of this sequence ?
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The Sum Formula
The formula says that the sum of the first n terms of our arithmetic sequence is equal to n divided by 2 times the sum of twice the beginning term, a, and the product of d, the common difference, and n minus 1. The n stands for the number of terms we are adding together.
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x + x = n
=)2x= n is the correct answer
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