Question

What operation can I use to find the number of seats in both groups of sidestreets write the expression

Answer 1

$C(n, k) =\begin{pmatrix} n \\ k \end{pmatrix}=\frac {n!} {k! (n-k)!}$

Where:

n – the total number of elements in a set

k – the number of selected objects (the order of the objects is not important)

! – factorial