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in Mathematics by (150k points)

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

(b) 3r + 1 

(c) 2r 

(d) 2r + 1.

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