[Step-by-Step] A vaccine has a 90% probability of being effective in preventing a certain disease. The probability of getting the disease if a person is
Question: A vaccine has a 90% probability of being effective in preventing a certain disease. The probability of getting the disease if a person is not vaccinated is 50%. In certain geographic region 25% of the people get vaccinated. If a person is selected at random, find the probability that he or she will contract the disease.
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