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JEE Main2002MathematicsBinomial TheoremActual

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

Options

  1. A3r
  2. B3r + 1
  3. C2r
  4. D2r + 1

Correct answer

C. 2r

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