Outside a home, there is a 9-key keypad numbered 1 through 9. The correct four-digit code will open the garage door. The numbers can be repeated in the code. (a) How many codes are possible? (b) What is the probability of entering the correct code on the first try, assuming that the owner doesn't remember the code?

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mjj00195612 mjj00195612

02-10-2022
Mathematics

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Outside a home, there is a 9-key keypad numbered 1 through 9. The correct four-digit code will open the garage door. The numbers can be repeated in the code. (a) How many codes are possible? (b) What is the probability of entering the correct code on the first try, assuming that the owner doesn't remember the code?

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