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[" The coefficient of "x^(5)" in the exp...

[" The coefficient of "x^(5)" in the expansion of "(1+x)^(21)+(1+x)^(22)+...+(1+x)^(30)" is "],[[" 1) "^(51)C_(5)," 2) "^(9)C_(5)," 3) "^(31)C_(6)-^(21)C_(6)," 4) "^(30)C_(5)+^(20)C_(5)]]

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