10.Show that the set {1,2,4,5,7,8} is Group under multiplication modulo 9

Show that the set {1,2,4,5,7,8} is Group under multiplication modulo 9
If order of element x is odd then there exists element y such that y^2=x
Show that a group of even order has an element of order 2
Orders of a and b^-1ab are equal (proof)
Orders of a and a^-1 are equal | Orders of element and its inverse are same
In this video you will learn Order of a group | Order of an element | Fully Concept Explained | Must watch
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