1.

If C denotes the binomial coefficient .^(n)C_(r) then (-1)C_(0)^(2)+2C_(1)^(2)+5C_(2)^(2)+……+(3n-1)C_(n)^(2)=

Answer»

`(3n-2)2nC_(N)`
`((3n-n)/(2))2nC_(n)`
`(5+3n)2nC_(n)`
`((3n-5)/(2))2nC_(n)`

ANSWER :B


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