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The Backpage: My Favorite Lesson
The Back Page: My Favorite Lesson: Why Do We Need Proof?

Janet M. Shiver; Edited by Jennifer Wexler 

October 2013, Volume 107, Issue 3, Page 240

Abstract:
A well-known counting problem convinces students that proof is necessary.

Keywords:
Article
Grades 9-12
Permutations / Combinations / Counting Problems
Teacher
Reasoning and Proof