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If (1+x)^n = C0 + C1x + C2x^2 + ………. + C...

If `(1+x)^n = C_0 + C_1x + C_2x^2 + ………. + C_n x^n` , prove that :
`C_0 + 2C_1 + ….. + 2 ""^nC_n = 3^n`

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