Question: A security system uses a four-letter password, but no letter can be used more than once. How many possible passwords are there if 24 of

A security system uses a four-letter password, but no letter can be used more than once. How many possible passwords are there if 24 of the letters of the alphabet can be used by the system?(Use these numbers for this question only!)

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Personal role: This consists of service to family and friends.

The role of life: It consists of your own service to yourself.

Competence: What knowledge, skills and attitude do I have towards what I am going to do?