Permutations And Combinations

Match the items on the right to the items on the left.

{}^{n}P_{n}

{}^{n}P_{0}

{}^{n}P_{1}

{}^{n}P_{n - 1}

\frac{{}^{n}P_{r}}{{}^{n}P_{r - 1}}

n !

n - r + 1