Math is the study of abstractions. Math allows us to isolate one or a few features such as the number, shape or direction of some kind of object. Then we can study what can be learned about the behavior of those features while ignoring everything else about the object.
The probability of a one being rolled in a fair die is 1 in 6,
or 0.1666... . The probability of a one not being rolled is 5 in 6,
or 0.8333... . The probability, then, of exactly one one being
rolled in nine rolls is 1 in 6 times 5 in 6 to the 8th power, or