How do you find a probability of an event?

To find the probability of an event, you can use the formula ( P(E) = \frac{n(E)}{n(S)} ), where ( P(E) ) is the probability of the event, ( n(E) ) is the number of favorable outcomes for the event, and ( n(S) ) is the total number of possible outcomes in the sample space. Ensure that the outcomes are equally likely. For example, the probability of rolling a 3 on a fair six-sided die is ( P(3) = \frac{1}{6} ) since there is one favorable outcome (rolling a 3) out of six possible outcomes.