Edward C. answered 05/28/15
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If you are given that the number rolled was a 6, then the probability that the number rolled was even is equal to 1, since 6 is an even number.
Or did you mean to ask what is the probability that a 6 was rolled, given that the number rolled was even? In this case there are 3 possibilities for an even roll (2, 4 or 6), 1 of which is equal to 6, so P(6|even) = 1/3.