The probability is 5/16 = 0.3125
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The probability of of rolling three ones on three dice is (1 in 6)3, or 1 in 216, or about 0.004630.
With one roll of three dice, the probability is 7/8.
The answer depends on what you are rolling: three or more ordinary dice, or fewer dice with non-standard numbers on them, or a die with some other shape.
The probability of rolling two prime numbers on a standard pair of dice is 1 in 4, or 0.25. Take the probability of rolling a prime on one die, 3 in 6, or 1 in 2, or 0.5, and square it.
The probability of rolling doubles with two dice is 1 in 6, or about 0.167.