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Sum Arithemetic Series Sn=n(t1+tn)/2 or Sn=n(a+tn)/2 - YouTube
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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
Sum of the first n terms of an Arithmetic Sequence - Formula 1 - 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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Solved Find the partial sum S13 for the arithmetic sequence | Chegg.com
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
Solved If the nth partial sum of a series an is Sn=n-2/n+2 | Chegg.com
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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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PDF) Using Calculators in Mathematics 12. Student Text | Gerald Rising - Academia.edu
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Gauss's Problem and Arithmetic Series 5
