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How many different four -letter strings can be formed from the letters A, B, C, D, E (repeats allowed) if the first letter must be
How many differentfour-letter strings can be formed from the letters A, B, C, D, E (repeats allowed) if the first letter must be avoweland the last letter must be aconsonant?
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Introduction to graph theory
Authors: Douglas B. West
2nd edition
131437372, 978-0131437371
