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Mathematics, 22.06.2021 05:10 anna8352

Outside a home, there is a 4-key keypad with letters A, B, C, and D that can be used to open the garage if the correct four-letter code is entered. Each key may be used only once. How many codes are possible?

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Outside a home, there is a 4-key keypad with letters A, B, C, and D that can be used to open the gar...

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