Question: The default passcode on a cellphone is usually 4 digits, each 0-9. a. How many different passcodes are possible? b. If you can enter a

The default passcode on a cellphone is usually 4 digits, each 0-9. a. How many different passcodes are possible? b. If you can enter a 4-digit passcode in one second, about how long would it take you to try all possible passcodes?

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