With one roll of three dice, the probability is 7/8.
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If they are fair dice the probability of rolling an even number on at least one of the three dice is 7/8.
1/2
Rolling a dice and getting an even number is an outcome. It is the result of rolling a dice.
The probability is 5/16 = 0.3125
There could be many questions: What is the probability of rolling an even number. What is the probability of rolling an odd number. What is the probability of rolling a number less than 4. What is the probability of rolling a number more than 3. What is the probability of rolling 1,4, or 6. Basically it could be any question about the probability of rolling half of the faces.
The probability of getting an odd number when you roll one die is 1 in 2. In order to get an odd sum with two dice, one of them has to be odd and one of them has to be even. The probability of rolling an odd sum is still 1 in 2, since each die is unrelated in probability to the other.