Let Z_(5)^( imes )denote the set {1,2,3,4}. Show that Z_(5)^( imes )is a group under multi-
plication mod 5. (You do not have to show that multiplication mod 5 is
associative.)
Let Z denote the set {1,2,3,4}. Show that Z is a group under multi plication mod 5. You do not have to show that multiplication mod 5 is associative.)