SOLUTION: 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 on

SOLUTION: 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 on

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Question 1041573: 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?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Depends on how many keys are used.
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