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Question Number 121041 by bramlexs22 last updated on 05/Nov/20

$$\sum _{\mathrm{k}=1}^{\mathrm{n}}{(-1)}^{\mathrm{k}}.\mathrm{k}=?$$

Answered by Dwaipayan Shikari last updated on 05/Nov/20

$$-1+2-3+4-5+6-7+8-...=\frac{n}{2}$$

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