The answer depens on how many dice are rolled. And since you have chosen not to divulge that critical bit of information, it is not possible to give a more useful answer.
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The probability of rolling a number less than 6 on a die would be 5/6.
There is a 4 in 6 (or 2 in 3) probability of rolling a number less than a five on a standard number cube.
The probability is 1.
It is 1.
1:6