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

asked Jul 21, 2022 78.5k views

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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.

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