The American Red Cross says that about 45.4​% of the U.S. population has Type O​ blood, 40.2​% Type​ A, 10.5​% Type​ B, and the rest Type AB. Complete parts a and b. b) There are four potential donors. 1. What is the probability that all are Type​ O? 2. What is the probability that no one is Type​ AB? 3. What is the probability that they are not all Type​ A? 4. What is the probability that at least one person is Type​ B?

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