1.

r and n are positive integers r gt 1,n gt 2 and coefficient of (r + 2)^(th) term and 3r^(th) term in the expansion of (1 + x)^(2n) are equal, then n equals

Answer»

`3R`
`3r + 1`
`2R`
`2r + 1`

ANSWER :C


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