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[" (a) "2],[" If "(1+x)^(n)=C(0)+C(1)x+C...

[" (a) "2],[" If "(1+x)^(n)=C_(0)+C_(1)x+C_(2)x^(2)+.........+C_(n)x^(2)," then "C_(0)^(2)+C_(1)^(2)+C_(2)^(2)+C_(3)^(2)+......+C_(n)^(2)=],[" (a) "(n!)/(n!n!)quad " (b) "((2n)!)/(n!n!)quad " (c) "quad ((2n)!)/(n!)]

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