Question: The author uses a home security system that has a code consisting of 4 digits (0, 1, . . . , 9) that must be

The author uses a home security system that has a code consisting of 4 digits (0, 1, . . . , 9) that must be entered in the correct sequence. The digits can be repeated in the code.
a. How many different possibilities are there?
b. If it takes a burglar 5 seconds to try a code, how long would it take to try every possibility?

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