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We roll three fair six-sided dice. (a) What is the probability that at least two of...

We roll three fair six-sided dice.
(a) What is the probability that at least two of the dice land on a number greater than 4?

(b) What is the probability that we roll a sum of at least 15?
(c) Now we roll three fair dice n times. How large need n be in order to guarantee a better
than 50% chance of rolling a sum of at least 15, at least once?

Math   Statistics-And-Probability   
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