Question

What is the value of 5P4?

Answer 1

`120`

Explanation:

`"Using" rArr ^nP_r = (n!)/((n - r)!)`

`5P4`

Where `n = 5` and `r = 4`

`5P4 = (5!)/((5 - 4)!) = (5!)/ (1!) = (5 xx 4 xx 3 xx 2 xx 1)/1`

`color(white)(xxx) = 120/1`

`color(white)(xxx) = 120`