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Outside a home, there is a10-keykeypad with letters

/in /by

Question

Outside a home, there is a10-keykeypad with letters Upper A comma Upper B comma Upper C comma Upper D comma 

Upper E comma Upper F comma Upper G comma Upper H comma Upper I comma and Upper Jthat can be used to open the garage if the correct ten-lettercode is entered. Each key may be used only once. How many codes are possible?

The number of possible codes is nothing

 
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