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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")
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Why am I not able to use Sn=n/2[2a+(n-1)d] here, but the mark scheme uses n/ 2(a+l)? - The Student Room
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