SOLUTION: how many different id cards can be made if there are four digits on a card and no digit can be used more than once

Question 1148640: how many different id cards can be made if there are four digits on a card and no digit can be used more than once
Found 2 solutions by ikleyn, Alan3354:
Answer by ikleyn(52781) (Show Source): You can put this solution on YOUR website!
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10*9*8*7 different ID cards, under the given conditions.

Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
how many different id cards can be made if there are four digits on a card and no digit can be used more than once
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If leading zeroes are accepted, eg, 0123, it's
10*9*8*7
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If not, it's 9*9*8*7
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