Duc N. answered 06/17/14
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If sum is 4, then there are just 2 dice possibilities which are:
1 and 3
2 and 2
As you see, the only one that has both numbers even is the "2 and 2". Hence the probability is 1/2.
Duc N.
Philip is correct!
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06/17/14
Philip P.
06/17/14