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If (1+x)^n=c0+C1x+C2x^2++Cn x^n ,using ...

If `(1+x)^n=c_0+C_1x+C_2x^2++C_n x^n `,using derivative prove that `C_1+2C_2++nC_n=n .2^(n-1)` `C_1-2C_2+3C_3++(-1)^(n-1)nC_n=0`

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