Sum of the first n terms of an arthmetic sequence

Algebra
Tutor: None Selected Time limit: 1 Day

Nov 28th, 2015

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By the way ,To find the sum of the first n terms of this  arithmetic series use the formula,

where n is the number of terms, a1 is the first term and an is the last term.

Please let me know if you need any clarification. I'm always happy to answer your questions.
Nov 28th, 2015

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Nov 28th, 2015
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Nov 28th, 2015
Dec 9th, 2016
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