Question: Question 7 A security system uses a four-letter password, but no letter can be used more than once. How many possible passwords are there if

 Question 7 A security system uses a four-letter password, but no

letter can be used more than once. How many possible passwords are

Question 7 A security system uses a four-letter password, but no letter can be used more than once. How many possible passwords are there if 9 of the letters of the alphabet can be used by the system ? (Use these numbers for this question only !)

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