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A) Prove that a group G is abelian iff (ab)^2=a^2b^2 fir any two ekemwnts a abd...

A) Prove that a group G is abelian iff (ab)^2=a^2b^2 fir any two ekemwnts a abd b in G.
B) Provide an example of a finite abelian group.
C) Provide an example of an infinite non-abelian group.
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