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

Lafi asked Oct 12, 2022

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Lafi asked Oct 12, 2022

by Lafi

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14 votes

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.

PiyushMishra answered Oct 18, 2022

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