What are Factorials?

So, you see a problem that looks like this 5!

That is 5 factorial. All that means is you multiply 5 x 4 x 3 x 2 x 1 = 120

 If you see a fraction like this 6!/4!

Well you know how 6! means 6 x 5 x 4 x 3 x 2 x 1 and 4! means 4 x 3 x 2 x 1

All you have to do is cross out the numbers they have in common so, the problem is 6 x 5.

Therefore, your answer is 30.

Factorial Practice