Assuming that it is a three-sided die, the only possibliliies are 3 and 6, 2 choices out of six possible 1/3 probability.
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On a single roll is it 2/3.
It is 1/3.
On a single roll it is 2/3.
3/6
If you roll the die often enough the probability is near enough 1 so as to make no difference. On a single roll, the probability is 1/2.