PDA

View Full Version : Probability: rolling one 6 w/ four die, one OR MORE 6s w/



bbash30
04-08-2008, 01:39 PM
What is the probability of rolling exactly one 6 with four die?

What is the probability of rolling at least one 6 with four die?

tkhunny
04-08-2008, 03:58 PM
1) The plural of "die" is "dice".

Pr(rolling a 6 with one die) = 1/6

Pr(rolling exactly one 6 with two dice) = PR(hitting the first and not the second) + Pr(Hitting the second and not the first) = (1/6)(5/6) + (5/6)(1/6) = 10/36

You can make a tree. There are several ways to go about getting all the way up to four dice.