Question

Can someone help me with this and explain: Compute 28P7

Answer 1

Using the factorial notation of the permutation formula, we get:


`nPr = (n!)/((n - r)!)`

`28P7 = (28!)/((28 - 7)!)`

`= 28 \cdot 27 \cdot 26 \cdot 25 \cdot 24 \cdot 23 \cdot 22`

`= 5 967 561 600`