GMAT Practice Question Set #55 (Question 163-165)

Problem Solving Question #163: Passwords 4 or 5 characters  
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A computer system uses alphanumeric case sensitive characters for its passwords. When the
system was created it required users to create passwords having 4 characters in length. This
year, it added the option of creating passwords having 5 characters in length. Which of the
following gives the expression for the total number of passwords the new computer system can

Assume there are 62 unique alphanumeric case sensitive characters.











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