The answer depends on what is being rolled, how many times and also on what variable is being recoded.
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If you mean rolling dice, there is no certainty - only probabilities.The probability of having both even numbers on two dice is (1/2) x (1/2) = 1/4.
There is a one out of four chance of having both dice even numbers.
Both rolling and eight or picking three dice from a jar could be possible outcomes of an experiment.
It is 1/4.
The question is underspecified since the answer depends on the numbers on the dice. If all the numbers on both the dice are the same, there is clearly only one outcome. If the dice have 4 different numbers, then there can be 16 different outcomes. If the numbers on each die are 1,2,3 and 4 (or any four numbers in arithmetic sequence) there will be 7 outcomes.
There are four outcomes possible. Both even, both odd, and one of each twice. So, in one roll, it looks like your chances are 1 in 4. Is that what you are after?