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Secured doors at airports and other locations are opened by pressing the correct sequence of numbers on a control panel. If the correct panel contains the digits 0-9 and three digit code must be entered (repetition is permitted)

a) How many different codes are possible?

b) If one code is entered at random, find the probability the correct code is entered.

Solution Summary

This solution finds the number of possible codes and the probability of finding the correct code at random.