Outside a home there is a 10-key keypad with letters a b c


Outside a? home, there is a 10?-key keypad with letters A, B, C, D, E, F, G, H, I, and J that can be used to open the garage if the correct ten?-letter code is entered. Each key may be used only once. How many codes are? possible?

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Basic Statistics: Outside a home there is a 10-key keypad with letters a b c
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