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Question-143018




Question Number 143018 by aupo14 last updated on 08/Jun/21
Answered by Dwaipayan Shikari last updated on 08/Jun/21
(−1)^(n+1)         n starts from 1
$$\left(−\mathrm{1}\right)^{{n}+\mathrm{1}} \:\:\:\:\:\:\:\:{n}\:{starts}\:{from}\:\mathrm{1} \\ $$

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