Using the pigeonhole principle: In a 20-item quiz, at least how many of the 35 students can have the same score?

Algebra and Trigonometry (MindTap Course List)
4th Edition
ISBN:9781305071742
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter14: Counting And Probability
Section14.1: Counting
Problem 20E
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Using the pigeonhole principle:

In a 20-item quiz, at least how many of the 35 students can have the same
score?

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