Question

What is ${}^{n}C_r$ in math?

Answer 1

Interpretation of ${}^{n}C_r$.

In mathematics, combination or ${}^{n}C_r$, is the method of selection of $r$ items from a set of $n$ items where the order of selection does not matter.

Formula: ${}^{n}C_r=\frac{n!}{r!\left(n-r\right)!}$