Question

How do you calculate$nCr$probability?

Answer 1

A combination is a set of ordered things and no matter what order is' it helps to find the number of possible combinations that

can be obtained by taking a subset of items from a larger set.

$"{}^{n}c_r"$ represents the combination formula

To calculate combinations we use the$"{}^{n}c_r"$ formula:

${}^{\mathbf{n}}\mathit{c}_{\mathbf{r}}\mathbf{=}\mathit{n}\mathbf{!}\mathbf{/}\mathit{r}\mathbf{!}\mathbf{*}\mathbf{(}\mathbf{n}\mathbf{-}\mathbf{r}\mathbf{)}\mathbf{!}\mathbf{,}$

where $n=numberofitems$

and $r=numberofitemsbeingchosenatatime.$