Show that the set {5, 15, 25, 35} is a group under multiplication module 40.What is the identity element of this group.

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter3: Groups
Section3.4: Cyclic Groups
Problem 39E
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Show that the set {5, 15, 25, 35} is a group under multiplication module 40.
What is the identity element of this group.

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