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hello can you explain this for me, why we didn't solve it by saying 10987=5040 (discrete) thanks in advance The entrance to a computer server

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hello can you explain this for me, why we didn't solve it by saying 10987=5040 (discrete)

thanks in advance

The entrance to a computer server room is controlled by a 4-digit passcode. A passcode is not allowed to have repeated digits of the same value. How many passcodes are available to choose from? Selected Answer: 85,040 Correct Answer: 9,990

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