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Let C = {1, 4, 5} and D = {2, 7}.

• List the elements of C × D.

• If there are 140 elements in D × A, how many elements are in A?

• Give an example of a relation from D to C that is not a function. Draw a graph of the

relation. Explain why it is not a function.

• Give an example of a relation from C to D that is a function. Draw an arrow diagram for the relation