How many 2-letter code words can be formed from the first 3 letters of the alphabet if

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How many 2-letter code words can be formed from the first 3 letters of the alphabet if no letter can be used more than once?
Solve Problem two ways:
(A) Using a tree diagram, and
(B) Using the multiplication principle.
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Related Book For  book-img-for-question

College Mathematics for Business Economics Life Sciences and Social Sciences

ISBN: 978-0321614001

12th edition

Authors: Raymond A. Barnett, Michael R. Ziegler, Karl E. Byleen

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