SOLUTION: he must select a password containing 4 nonzero digits to be able to use the card .how many passwords are allowed if no digit may be used mare than once?

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Question 499069: he must select a password containing 4 nonzero digits to be able to use the card .how many passwords are allowed if no digit may be used mare than once?
Answer by chessace(471) About Me  (Show Source):
You can put this solution on YOUR website!
9*8*7*6 = 3024.