Events A and B are complementary events if A and B are mutually exclusive (have no overlap) and \(\;Pr(A)\;+\;Pr(B)\;=\;1\), where the symbol \(Pr(A)\;\) denotes the probability of event \(A\) occurring.
Events A and B are complementary events if A and B are mutually exclusive (have no overlap) and \(\;Pr(A)\;+\;Pr(B)\;=\;1\), where the symbol \(Pr(A)\;\) denotes the probability of event \(A\) occurring.