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Outside a home, there is a 9key keypad with letters A, B, C, D, E, F, G, H, and lthat can be used to open

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Outside a home, there is a 9key keypad with letters A, B, C, D, E, F, G, H, and lthat can be used to open the garage if the correct nine-letter code is entered. Each key may be used only once. How many codes are possible? (Z) The number of possible codes is D

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