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

Computers and Technology

1 answer:

vesna_86 [32]3 years ago

8 0

Answer:

-1/12

Explanation:

$\sum_{k=0}^{k=n} k = \frac{n(n+1)}{2}\\$

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

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