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Compute the value of  1-2+3-4+...+2019-2020+2021/

 May 16, 2022
 #1
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The sum is 1015.

 May 16, 2022
 #2
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(- 1) x 2020/2 + 2021 ==(- 1) x 1010 + 2021 ==- 1010 + 2021 ==1011

 May 16, 2022

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