1.

C_0 + C_1 + 2.C_2(3) + 3.C_3(3^2)+ 4.C_4(3^3) + ……+n.C_n 3^(n-1) =

Answer»

`n.4^(n-1) + 1`
`2N. 4^(n-1) + 1 `
`n.4^(n-1) - 1`
`n.4^(n+1) - 1`

ANSWER :A


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