Question: Outside a home, there is a 4-key keypad numbered 1 through 4. The correct seven-digit code will open the garage door. The numbers can be

Outside a home, there is a 4-key keypad numbered 1 through 4. The correct seven-digit code will open the garage door. The numbers can be repeated in the code.

How many codes arepossible?
What is the probability of entering the correct code on the firsttry, assuming that the ownerdoesn't remember thecode?

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