Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN: 9780470458365
Author: Erwin Kreyszig
Publisher: Wiley, John & Sons, Incorporated
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Question

Each character in a password of length six can be any uppercase letter from A-Z or any symbol from the list: %,&,$,#,@. For this problem, you may leave your answers unreduced.

(a) How many passwords are possible?

(b) How many passwords are possible that do not repeat any letters or symbols?

(c) How many passwords are possible that have at least one character repeated?

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