Poker dice is played by simultaneously rolling 5 dice.

a) Describe the sample space S; how many points are there?

6^5=7776 Is this correct?

b) Show that P(no two dice show the same number) = .0926

I know I need to use 1-P(A) and P(A) is the prob that two dice show the same number.

How do I find P(A)?

Thanks