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Three fair dice are rolled. Let X be the total number of spots showing, that is...

Three fair dice are rolled. Let X be the total number of spots showing, that is the sum of the results of the three rolls.
a) Find the probabilities P(X= 3), P(X= 4), P(X= 17), P(X= 18).

b) Find the probability P(X≥ 11).
Math   Statistics-And-Probability   
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