How To Evaluate The Expression 4p3?

A permutation is an arrangement of objects in a specified order. The
total number of ways to arrange 'r' items out of total 'n' items,
regarding the order of selection, is ⁿP_r.

ⁿP_r= n!/(n-r)!

In the given question ⁴P₃, n=4 and r=3.

⁴P₃ = 4!/ (4-3)!

⁴P₃= 4!/ 1!

⁴P₃= 24