Usually, yes.
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You look at the denominator first. Then you try to find out what exponents make the denominator. After doing that, you add a negative symbol to the smaller number on the exponent.
If the events are independent then you can multiply the individual probabilities. But if they are not, you have to use conditional probabilities.
Repeated trials.
You can find a missing denominator if you know something that the fraction is equal to. Then you can find the missing denominator through cross multiplication.
You divide the numerator by the denominator.