If r and n are positive integers such that r>1, n>2 and coefficients of (r+2) th term and…
Mathematics · JEE Main · NTA Exams — Binomial Theorem And Its Simple Applications
If r and n are positive integers such that \(r>1, n>2\) and coefficients of
\((r+2)\)th term and 3rth term in the expansion of \((1+x)^{2 n}\) are equal, then n equals
- 3r
- \(3 r+1\)
- 2r
- \(\mathrm{Zr}+1\)
Answer
(B) 3 r+1
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