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7. Consider a virus that is potentially spread by blood infusion (although this is not the only way to contract the virus) Suppose the probability of both receiving contaminated blood and being infected by the virus is 0.005, and the probability of being infected if someone receives contaminated blood is 0.20. (a) Find the probability of blood being contaminated. (b) Find the probability of not being infected if someone receives contaminated blood(c) Find the probability of (not being infected) union (blood is not contaminated).

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