Question 617856
P(n,r) = (n!)/((n-r)!)


P(12,3) = (12!)/((12-3)!)


P(12,3) = (12!)/(9!)


P(12,3) = (12*11*10*9!)/(9!)


P(12,3) = 12*11*10


P(12,3) = 1320