Which Expression Is Equal To $\left( \begin{array} { l } N \\n\end{array} \right) ?$

Multiple Choice

Which expression is equal to $\left( \begin{array} { l } N \\n\end{array} \right) ?$

A) $\frac { N ! } { ( N - n ) ! }$
B) $\frac { N ! } { n ! ( N - n ) ! }$
C) $\frac { N ! } { N ! ( N - n ) ! }$
D) $\frac { N ! } { n ! }$