Answer
4
Work Step by Step
4 four-letter sequences can be formed from the letters a,a,a,b, because the only thing we can choose is where to put the b in the sequence. (The other 3 letters are a's)
Finite Math and Applied Calculus (6th Edition)
by Waner, Stefan; Costenoble, Steven
Published by
Brooks Cole
ISBN 10:
1133607705
ISBN 13:
978-1-13360-770-0
Chapter 6 - Section 6.3 - Decision Algorithms: The Addition and Multiplication Principles - Exercises - Page 423: 13
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