Answer:
1/2
Step-by-step explanation:
The first time he rolls the dice, he has a 1/2 chance of getting an even number, since half the numbers are even. The second time he rolls, that probability doesn't change, because it doesn't depend on the first roll. If the question was asking, what is the chance he rolls evens twice, the answer would be 1/4 because the 1/2 probability would be multiplied by 2, but in this case, the probability won't change.