how do u solve for n?(adsbygoogle = window.adsbygoogle || []).push({});

nP3=720........n!/(n-3)!=720.....do u just start cancelling?

that will be n(n-1)(n-2)=720...but its such a big number...is there another easier way to do it?

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: How do u solve for n Permutations

**Physics Forums | Science Articles, Homework Help, Discussion**