Let X = {1, 5, 9} and Y = {3, 4, 7}.a. Define f: X ? Y by

Chapter 7, Problem 6E

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Problem 6E

Let X = {1, 5, 9} and Y = {3, 4, 7}.

a. Define f: X → Y by specifying that

f(1) = 4, f(5) = 7, f(9) = 4.

Is f one-to-one? Is f onto? Explain your answers.

b. Define g: X → Y by specifying that

g(1)= 7, g(5) = 3, g(9) = 4.

Is g one-to-one? Is g onto? Explain your answers.

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