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[Solved] Finding the expression

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1-2+3-4+5-6+......+45-46=?

A) -23    B)-13   C) 0   D) 13   E)23

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\small A=1+3+5+.....+45\Rightarrow 2n-1=45\Rightarrow n=23\Rightarrow A=23^2=529

\small B=2+4+6+....+46=2n=46\Rightarrow n=23\Rightarrow B=23.24=552

\small \Rightarrow 1-2+3-4+5-6+....+45-46=A-B=529-552=-23.

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