A defendant in a paternity suit was given a series of n independent blood tests, each of which excludes a wrongfully-accused man with probability Pk, where 1 ≤ k ≤n. If a defendant is not excluded by any of these tests, he is considered a serious suspect. If, however, a defendant is excluded by a least one of the tests, he is cleared. Find the probability, p, that a wrongfully-accused man will in fact be cleared by the series of tests.