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Tinh S(n) = 1+2+3+.....+n
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Tinh S(n) = 1+2+3+.....+n

User Shomik
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Answer:

-1/12

Step-by-step explanation:


\sum_(k=0)^(k=n) k = (n(n+1))/(2)\\

look up the derivation by Srinivasa Ramanujan for a formal proof.

User Arthur Klezovich
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