Multiple Choice Question: The Department of Health encourages elderly people to have a flu vaccination each year.

The Department of Health encourages elderly people to have a flu vaccination each year. The vaccination reduces the likelihood of getting a flu from 40% to 10%. If 45% of the elderly people visiting the doctor have the vaccination, find the probability that an elderly person chosen at random had the vaccination, given that they get flu.

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Orphaned Multiple Choice Questions (MCQ) due to changes of exam system.

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