Outside a​ home, there is aa 44​-key keypad with letters Upper A comma Upper B comma Upper C comma and Upper DA, B, C, and D that can be used to open the garage if the correct fourfour​-letter code is entered. Each key may be used only once. How many codes are​ possible?

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A:

Q: Outside a​ home, there is a 9​-key keypad with letters A, B, C, D, E, F, G, H, and I that can be…

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