In a school celebration, the probability that the governor attends is
0.81, and that of the general director of
education attends is 0.75, while the probability that
both of them attend is 0.61. Find the probability
that the general director of education ONLY attends.
In this case, event is the governor attending the school
celebration, and event is the general director of education
attending. The notation refers to the probability of the
occurrence of and the non-occurrence of . Also, the
notation refers to the probability of events and
occurring together. For this reason, is equal to the
sum of and . Use this fact to solve for
Thus, the probability that only the general director of education attends is 0.14.