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![S_n=(n/2)*[2a+(n-1)d] Full STEP by STEP Comprehensive Proof (Arithmetic Series, C1 Mathematics) - YouTube](https://i.ytimg.com/vi/6U_qxdBGIwU/maxresdefault.jpg "S_n=(n/2)*[2a+(n-1)d] Full STEP by STEP Comprehensive Proof (Arithmetic Series, C1 Mathematics) - YouTube")
S_n=(n/2)*[2a+(n-1)d] Full STEP by STEP Comprehensive Proof (Arithmetic Series, C1 Mathematics) - YouTube
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![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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