SOLUTION: a contractor builds homes of 9 different models and presently has 3 lots to build on. In how many different ways can he arrange homed on this lot? assume 3 different models will be

Algebra ->  Permutations -> SOLUTION: a contractor builds homes of 9 different models and presently has 3 lots to build on. In how many different ways can he arrange homed on this lot? assume 3 different models will be      Log On


   

Question 842009: a contractor builds homes of 9 different models and presently has 3 lots to build on. In how many different ways can he arrange homed on this lot? assume 3 different models will be built
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
There are 9*8*7 = 504 different ways to do this.

Notice how I started out with 9 and counted down until I filled out 3 slots. Then I multiplied 9, 8, 7 to get 504. This is a shortcut to computing 9 P 3