An empirical estimate of the probability of an event is the ratio of the number of succesful outcomes to the total number of trials. By definition, the ratio is a fraction. However, there are many events for which the theoretical probability is related to Irrational Numbers. For example, it you randomly drop a pin on a floor of wooden boards, the probability that the pencil lies across a lateral join is related to pi. Being irrational, this cannot be expressed as a fraction.
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Only when an event is probability to happen between a range of 1 to 0 then it is a fraction.
fraction
The answer depends on what you want to turn into a fraction. And, incidentally, I do not turn into a fraction.
No, because a probability must lie in the interval [0, 1].
When you turn a fraction over you get a reciprocal.