The sum of the first n terms of the series 1 - 2- 3 -4-n is Sn-nn-12

The correct option is A TrueWe have, 1+2+3+4+......+n a=1, d=1 We know that S_n=n2[2a+(n 1)d] Therefore, S_n=n2[2× 1+(n 1)× 1] S_n=n2[2+n ...

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The sum of th...

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The sum of the first $n$ terms of the series $1 + 2 + 3 + 4 + . . . . . . . + n$ is $S_{n} = \frac{n (n + 1)}{2}$

True

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False

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