Mathematics · important
Useful combination recurrence 1 for JEE
Permutations and combinations
Formula
\(\,{}^nC_r=\dfrac{n}{r}\,{}^{n-1}C_{r-1}\)
Variables: \(n,r\) are integers.
Conditions: \(1\le r\le n\).
Simplifying expressions and solving equations involving binomial coefficients.