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If (1+x)^(15)=C0+C1x+C2x^2++C(15)x^(15),...

If `(1+x)^(15)=C_0+C_1x+C_2x^2++C_(15)x^(15),` then find the value of `C_2+2C_3+3C_4++14 C_(15)dot`

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