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[" 29.The value of "C(1)+2C(2)+3C(3)+......

[" 29.The value of "C_(1)+2C_(2)+3C_(3)+...+nC_(n)=?],[[" (a) "n.2^(n)," (b) "n.2^(n-1)],[" (c) "(n+2).2^(n-1)," (d) "(n+2).2^(n+1)]]

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