How do I solve this problem.

Question

I try just 1 than just 4
nether were right, than I try 4/4r

the Problem is 4Pr

Thank you

Answer 1

nPr=n!/(n-r)!
4Pr=4!/(4-r)!=24/(4-r)!

unless you know the value of r, this is the furthest we can go.

Answer 2

in general for n items taken r at a time
P(n,r) = n!/ (n-r)!

for n = 4 and r at a time
P(4,r) = 4!/(4-r)!

so for 4 taken 1 at a time
4!/3! = 4*3*2*1/(3*2*1) = 4

or for 4 taken 2 at a time
4!/(2)! = 4*3 *2*1/2*1 = 12

Answer 3

thank you Damon