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OUtside a home there is a 10 key pad with letters A, B, C, D, E, F, G, H, I, and J

OUtside a home there is a 10 key pad with letters A, B, C, D, E, F, G, H, I, and J that can be used to open the

garage if the correct 10 letter code is entered.  Each key may be used only one.  How many codes are possible?

 
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