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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!!

Note by Eman Abulmagd
3 years, 11 months ago

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Note that there is a minus sign before $$(-1)^{a}$$ for odd values of $$a$$.

- 3 years, 11 months ago

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.

Staff - 3 years, 11 months ago