Let n be an element in Z. Prove that 5|n^2 if and only if 5|n.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section: Chapter Questions
Problem 47RE
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Let n be an element in Z. Prove that 5|n^2 if and only if 5|n.

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