What is the value of 8P4?

1680 to get this answer you need to get the factorial of 8 and the factorial of 4!

like so 8! is n! 8*7*6*5*4*3*2*1=n!_40320

4! is r! 4*3*2*1=r!_24

now divide the two!

n!/r!(n-r)!=1680

8!/4!(8-4)!=1680

8!/4!=1680