SUPPOSE that g: A1--->A2 and f: A2--->A3. If B⊂ A3, show that (g ∘ f )^-1 ( B)= g^-1(f^-1)(B))

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I see that you have only two postings. So welcome. You do understand that this is not a homework service? So you need to either post some of your work on a problem or you need to explain what you do not understand about the question.

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