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Given positive integers rgt1,ngt2 and th...

Given positive integers `rgt1`,`ngt2` and the cofficients of` (3r)^(th )` and `(r+2)^(th)` term in the expansion of `(1+x)^(2n)` are equal then, which of the following relation is correct?

A

n=2r

B

n=3r

C

n=2r+1

D

n=r

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