Answer
at least two students have last names that begin with the same letter.
Work Step by Step
-there are 30 students , but only 26 letters .
-pigeonhole principle shows that at least two students must have
last name with same letter.
Discrete Mathematics and Its Applications, Seventh Edition
by Rosen, Kenneth
Published by
McGraw-Hill Education
ISBN 10:
0073383090
ISBN 13:
978-0-07338-309-5
Chapter 6 - Section 6.2 - The Pigeonhole Principle - Exercises - Page 405: 2
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