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IIT-JEE 1983

MCQ (Single Correct Answer)
Given positive integers $$r > 1,\,n > 2$$ and that the coefficient of $$\left( {3r} \right)$$th and $$\left( {r + 2} \right)$$th terms in the binomial expansion of $${\left( {1 + x} \right)^{2n}}$$ are equal. Then
A
$$n = 2r$$
B
$$n = 2r + 1$$
C
$$n = 3r$$
D
none of these

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