If the coefficients of (r + 4)th term and (2r + 1)th term in the expansion of (1 + x) 18…

Mathematics · JEE Main · NTA ExamsBinomial Theorem And Its Simple Applications

If the coefficients of (r + 4)th term and (2r + 1)th term in the expansion of (1 + x)18 are equal, then r =
  1. 3
  2. 5
  3. 3 or 5
  4. none of these

Answer

(C) 3 or 5

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