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Alternating sum of powers of negative one

Middle school · ●○○○○ 10 pts

Find (−1)−10+(−1)−9+(−1)−8+⋯+(−1)9+(−1)10(-1)^{-10} + (-1)^{-9} + (-1)^{-8} + \cdots + (-1)^9 + (-1)^{10}. (The sum has 21 terms, one for each integer exponent from −10-10 to 1010.)

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powers of negative one