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(10 marks) Let f : X-Y and g : Y ? X be functions such that g of 1x . Prove or give counterexample for
(10 marks) Let f : X-Y and g : Y ? X be functions such that g of 1x . Prove or give counterexample for each of the following statements: (a) f is one-to-one (b) f is onto (c) g is one-to-one (d) g is onto (e) f og = 1Y
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