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Tina has to create a password for the security of a software program file. She wants to use a password with 3 letters. How many passwords are allowed if no letters are repeated and the password is not case sensitive?

User Red Swan
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26*25*24 (number of letters for first)*(number of letters for second) * number of letters for third)
note: the number goes down as the one chosen cannot be repeated
User Commanda
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