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[" 76.The coefficient of "x^(9)" in the ...

[" 76.The coefficient of "x^(9)" in the expansion of "(1+x)(1+x^(2))(1+x^(3)).........(1+x^(20))" is "],[[" (A) "45," (B) "9],[" (C) "8," (D) "10]]

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