Question: Children joining a kindergarten class will be checked one after another to see if they have been inoculated for polio (I) or not (N). Suppose

Children joining a kindergarten class will be checked one after another to see if they have been inoculated for polio (I) or not (N). Suppose that the checking is to be continued until one no inoculated child is found or four children have been checked, whichever occurs first.

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