Main post link -> https://brilliant.org/practice/algebra/basic-operations-1/exponents/3/

In this Problem he solved it by breaking the question into brackets !! but even then each bracket will equal zero and by summing or subtracting those brackets we get 0 !!! how could he come up with that 23!!

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TopNewestNote that there is a minus sign before \((-1)^{a}\) for odd values of \(a\). – Shendy Marcello Yuniar · 3 years, 8 months ago

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The final answer is 26 (not 23 like you mentioned).

As pointed out, each of the terms contribute a value of 1 to the sum, and there are 26 terms. – Calvin Lin Staff · 3 years, 8 months ago

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