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The probability that a person in the United States has Type B+ blood is 8%. Four unrelated people in the United States are selected at random. Complete parts (a) through (d).
(a) Find the probability that all four have type B+ blood.
(b) Find the probability none have B+ blood.
(c) Find the probability that one of the four have B+ blood.
(d) Which of the events can be considered unusual? Explain.

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