in other words, the union of \(A\) and \(B\) is given by the union of all the outcomes in \(A\) with all the outcomes in \(B\) that are not in \(B\). To estimate the probability of an event \(A\), rep...in other words, the union of \(A\) and \(B\) is given by the union of all the outcomes in \(A\) with all the outcomes in \(B\) that are not in \(B\). To estimate the probability of an event \(A\), repeat the random experiment several times (each repetition is called a trial) and count the number of times \(A\) occurred, i.e., the number of times the resulting outcome is in \(A\).