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A passcode for a home security system must have 4 digits followed by 4 capital letters. 1. What is a possible passcode? (assume repetition is

A passcode for a home security system must have 4 digits followed by 4 capital letters. 1. What is a possible passcode? (assume repetition is allowed) 2. How many passcodes are possible? 3. How many passcodes are possible if repetition is not allowed? 4. How many more passcodes are possible with repetition than without

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