On a single toss of a six-sided die. The chance of rolling a one is 1/6, and the chance of not rolling a one is (1 - 1/6 = 5/6), or 83.333 %
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On a single roll it is 2/3.
It is 1/2.
One out of two
If zero is the number on one of the 9 sides, then the probability is 8/9 = 88.9% (rounded)If zero is not the number on any one of the 9 sides, then the probability is 100%.
1/6*1/2 = 1/12