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34. Suppose that g is a function from A to B and f is a function from B to C. Prove each of these statements. a) If f ◦g is onto, then f must also be onto. b) If f ◦g is one-to-one, then g must also be one-to-one. c) If f ◦g is a bijection,
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34. Suppose that g is a function from A to B and f is a function from B to C. Prove each of these st...
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