Mathematics, 03.07.2020 03:01 minixkevon

Outside a home, there is a 4-key keypad with letters Upper A comma Upper B comma Upper C comma and Upper 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 Upper A comma Upper B comma Upper C comma and U...