Answer
See below
Work Step by Step
This is a fundamental counting principle question.
If we can repeat we have 26 choices for letters and 10 for numbers,
a) $$26^4*10^{3}=456976000$$
b) $$26*25*24*23*10*9*8=258336000$$
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter 9, Counting and Probability - Chapter 9 Test - Page 686: 3
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