An electric component manufactured by 'RASU electronics' is tested for its defectiveness by a sophisticated testing device. Let A denote the even "the device is defective" and B the event "the testing device reveals the component to be defective." Suppose, P(A) = and P(B/A) = P(B'/A') = 1-a, where 0 < a < 1. Show that the probability that the component is not defective, given that the testing device reveals it to be defective is independent of a.