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[" If the sum of the series "20+19(3)/(5...

[" If the sum of the series "20+19(3)/(5)+19(1)/(5)+18(4)/(5)+...n" terms is "488" and the nth term is "],[" negative,then "],[[" (1) "n^(" th ")" term is "-4(2)/(5)," (2) "n=41],[" (3) "n^(" th ")" term is "-4," (4) "n=60]]

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