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Answer to Question #113175 in Algebra for Lizwi
Question #113175
Write -1/2 + 2/3 - 3/4 + 4/5 -... to n terms in sigma notation.
Expert's answer
"-\\frac{1}{2}+\\frac{2}{3}-\\frac{3}{4}+\\frac{4}{5}-...= \\sum_1^n(-1)^r\\frac{r}{r+1}"
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