Question: Each user has a pin 4 characters long where each character is an uppercase letter, a lowercase letter, or a digit. Each password must contain

Each user has a pin 4 characters long where each character is an uppercase letter, a lowercase letter, or a digit. Each password must contain at least one digit. How long will it take (these are, units of time) to check every possible character combination, if each check takes one unit of time?

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