spangleralanam spangleralanam

25-05-2022
Mathematics

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LammettHash LammettHash

25-05-2022

Regrouping terms in the sum as

x + (-5x + 5x) + (-9x + 9x) + … + (-21x + 21x) - 25x

you can see that all the middle terms cancel and you're left with

x - 25x = -24x

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