and are two mutually exclusive events from a sample space of a random experiment. The probability of occurrence of event is five times times that of event . If the probability of one of the two events occurring is at least 0.18, find the probability of event occurring.
Suppose the probability of event is . The probability of
event would then be . The notation refers to
the probability of either event or event occurring. If
and are two mutually exclusive events, then . Use this fact to solve for as follows: