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In: Electrical Engineering

How many passwords are possible? Passwords must: be more than 8 characters long but no more...

How many passwords are possible?

Passwords must:

  • be more than 8 characters long but no more than 30
  • Use lower case, upper case, a number, and a special character [like ~ ! @ # $ % ^ & * ( ) _ + = ? > < . , / ]

A mathematical expression is fine.
What kind of PMF will be used?

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