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It is 1/3.
The experimental probability of a number cube that lands on 5 four times in a twenty toss trial is Pexp(5) = 4/20 = 1/5 = 0.20 = 20%
For an ordinary number cube, the answer is 1/6
A number cube has six faces, so the probability of any one of them showing on a fair throw is 1 in 6, or about 0.1667.
The probability of rolling a seven with one roll of a standard number cube is zero.