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

Question

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

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