If the coefficients of (r + 4)th term and (2r + 1)th term in the expansion of (1 + x) 18…
Mathematics · JEE Main · NTA Exams — Binomial 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 =
- 3
- 5
- 3 or 5
- none of these
Answer
(C) 3 or 5
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