For every positive integer n, prove that 7n – 3n is divisible by 4.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter4: Polynomial And Rational Functions
Section4.2: Properties Of Division
Problem 51E
Question

For every positive integer n, prove that 7n – 3n is divisible by 4.

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