How do you evaluate 8P3?

1 Answer
May 20, 2017

Answer:

Take the factorial of the first number and divide it by the factorial of the second number subtracted by the first number.

Explanation:

The permutation formula is #""_nP_r=(n!)/((n-r)!# Since #n=8# and #r=3# We can just substitute values and solve:

#""_nP_r=(n!)/((n-r)!)=(8!)/((8-3)!)=(8cdot7cdot6cdotcancel(5cdot4cdot3cdot2cdot1))/cancel(5cdot4cdot3cdot2cdot1)#

#8*7*6=336#