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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 "]

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Find the coefficient of x^(5) in the expansion of (1+x)^(21)+(1+x)^(22)+...+(1+x)^(30)

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