The official formula for probability is x/y.
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It is the probability distribution function that is relevant for the experiment.
The formula for finding probability depends on the distribution function.
u mean formula?
I expect you mean the probability mass function (pmf). Please see the right sidebar in the linked page.
You need to know the probability of the event in question. Then the expected frequency for that event occurring is that probability times the number of times the experiment was repeated.