The complement of rolling a die and getting a 4 is rolling a die and getting a 1, 2, 3, 5, or 6.
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It is 0.25
the probability is 2/6
If the die is fair then for a single roll, the probability is 1/2.
It is 3/4.
When rolling one die, the probability of getting a 4 is 1 in 6, or 0.1667. If two dice are rolled, you get two unrelated chances of rolling at least one 4, so the probability is 2 in 6, or 0.3333.