Basically if you want to know the probability of rolling a “5” at least once when rolling a 6 sided die 6 times it goes like this:
The percentage for rolling anything except a 5 is 5/6 or 83.33...% probability. Now the probability of rolling every die roll NOT a 5 is 5/6 times 5/6 (6 times) or (5/6)^6 which comes to 33.49% probability that you will not roll even 1 “5” when rolling 6 times.
So the inverse (meaning you DO roll at least 1 “5”) is basically 100% minus the probability that you will NOT roll any “5”’s or 66.51% probability.
Remember though that there are lies, damn lies and then statistics. What I wrote above is considered statistics. :-)