SOLUTION: Two dice are rolled. The probability that their sum is at least 4 equals ____

SOLUTION: Two dice are rolled. The probability that their sum is at least 4 equals _____.

Question 746935: Two dice are rolled. The probability that their sum is at least 4 equals _____.
Answer by timvanswearingen(106) (Show Source): You can put this solution on YOUR website!
There are 6 numbers on each die so the number of possibilities is 6*6=36
Now, the probability that the sum is at least 4, would be easier found by using
1-P(sum is 3 or less)
Sums of 3 or less would include rolls of 1,1 1,2 2,1
therefore 3/36 or 1/12.
So, P(sum is 4 or more) = 1-P(sum is 3 or less) = 1 - 1/12 = 11/12

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