Compute the value of 1-2+3-4+5…+2019-2020+2021. Thanks

asked Feb 8, 2023 135k views

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13 votes

$1-2+3-4+5-\ldots+2019-2020+2021=1+2021+(-2-2020)+3+2019+\ldots+(-1010-1012)+1011=2022-2022+2022-\ldots-2022+1011=1011$

Experquisite answered Feb 12, 2023

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