When several textbooks are edited, none of them are found to be free of errors. At most one of the textbooks is free of errors.
One of the textbooks is free of errors. At least one of the textbooks is free of errors. All of the textbooks are free of errors. provide a written description of the complement of the given event
Answer: At least one of the textbooks is free of errors.
In statistics, the complementrule allows us to connect the probability of an event with the probability of the complement of an event. This is done so that, if we know the probability of one of these two, we can find out that of the other. In this case, the complement of the given event (w<em>hen several textbooks are edited, none of them are found to be free of errors</em>) is: <em>At least one of the textbooks is free of errors.</em>
