See the Basic Rules for Probability section in the related link.
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Probability = number of times an event is expected to happen / number of opportunities for an event to happen It can be expressed as a percentage or a fraction.
States that to determine a probability, we multiply the probability of one event by the probability of the other event. Ex: Probability that two coins will land face heads up is 1/2 x 1/2 = 1/4 .
Discrete probability. It helps if the all the outcomes in the sample space are equally probable but that is not a necessity.
It is the probability of an event that will definitely happen.
If the probability of an event is zero then that event cannot happen