Assume that a password to log onto a computer account is to consist of any four digits
Question:
Assume that a password to log onto a computer account is to consist of any four digits or letters (repetition is permitted). Determine the number of passwords possible if
(a) The letters are not case sensitive (that is, a lowercase letter is treated the same as an uppercase letter).
(b) the letters are case sensitive (that is, an uppercase letter is considered different than the same lowercase letter).
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Related Book For 
A Survey of Mathematics with Applications
ISBN: 978-0134112107
10th edition
Authors: Allen R. Angel, Christine D. Abbott, Dennis Runde
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