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[" In the expansion of "((1)/(x^(2))-x^(...

[" In the expansion of "((1)/(x^(2))-x^(3))^(n)n in N," if the sum of the coefficients of "x^(5)" and "x^(10)" is "0," then "n" is: "],[[" 1) "25," 2) "20," 3) "15," 4) None of these "]]

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