Show that if n is an integer and n³ + 5 is odd, then n is even using a) a proof by contraposition. b) a proof by contradiction.

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter6: More On Rings
Section6.1: Ideals And Quotient Rings
Problem 19E: 19. Let and be nonzero integers. Prove that if and only if divides .
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3. Show that if n is an integer and n3 + 5 is odd, then n is even using
a) a proof by contraposition.
b) a proof by contradiction.
Transcribed Image Text:3. Show that if n is an integer and n3 + 5 is odd, then n is even using a) a proof by contraposition. b) a proof by contradiction.
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