It depends on whether or not the events are independent.
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It is the probability of an event that will definitely happen.
If the probability of an event is zero then that event cannot happen
A compound event, in probability theory is an event which is made up of two (or more) simpler events. Thus, tossing two coins in a compound event made up of tossing one coin and tossing another coin. Getting soaked in rain consists of the simple events that it rains (where you are) and you are outdoors without an umbrella (at that time).
80%
For any event A, Probability (not A) = 1 - Probability(A)