Question: 6 A security system uses a 7-letter password, but no letter can be used more than once. How many possible passwords are there if 15

6 A security system uses a 7-letter password, but no letter can be used more than once. How many possible passwords are there if 15 of the letters of the alphabet can be used by the system? (Use these numbers for this question only!) For this question indicate only what the value of r is

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