Question

Evaluate p(4,2)
24
12
6

Answer 1

We can use the formula for permutations to solve this.

`p(n, r) = (n!)/((n-r)!)`
First we plug the numbers into the formula.

`p(4, 2) = (4!)/((4-2)!)`
Simplify.

`p(4, 2) = (4!)/(2!)`
Expand the factorials.

`p(4, 2) = (4*3*2*1)/(2*1)`
Cancel the 2*1.

`p(4, 2) = 4*3`
Finally, multiply 4*3 and find the final answer, which is 12.