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r and n are positive integers r gt 1,n g...

`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

A

`3r`

B

`3r + 1`

C

`2r`

D

`2r + 1`

Text Solution

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The correct Answer is:
C
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