1.

C_(1) + 4.C_(2) + 7.C_(3) +......+(3n - 2).C_(n) =

Answer»

`(3n - 4)2^(N + 1)`
`(3n - 4)2^(n - 1) + 2`
`(3n - 4).2^(n)`
`(3n - 4).2^(n - 1) + 1`

ANSWER :B


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