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[" The coefficient of "x^(7)" in the exp...

[" The coefficient of "x^(7)" in the expression "],[(1+x)^(10)+x(1+x)^(9)+x^(2)(1+x)^(8)+...+x^(10)" is "],[[" 1) "120," 2) "330],[" 3) "210," 4) "420]]

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