Jee Main
Permutations And Combinations
JEE Main 2024 (Online) 6th April Evening Shift
MCQ+4 / -12024
Let \(0 \leq r \leq n\). If \({ }^{n+1} C_{r+1}:{ }^n C_r:{ }^{n-1} C_{r-1}=55: 35: 21\), then \(2 n+5 r\) is equal to :
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