![Explain the terms in the formula. S(n) = n/2 [2a+(n-1)d].](https://d10lpgp6xz60nq.cloudfront.net/web-thumb/31084_web.png "Explain the terms in the formula. S(n) = n/2 [2a+(n-1)d].")
Explain the terms in the formula. S(n) = n/2 [2a+(n-1)d].
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