11. Find an example of sets C and D such that |C=4, D=5, and |CUD-9. 12....

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11. Find an example of sets C and D such that |C=4, D=5, and |CUD-9. 12. Consider the function f (n) = 3 from Z to Z. Is this function one-to-one? Is this function onto? Justify [4] your answer. 13. Consider the function f(n)=5n-8 from Z to Z. Is this function one-to-one? Is this function onto? Justify [4] your answer. [4] 11. Find an example of sets C and D such that |C=4, D=5, and |CUD-9. 12. Consider the function f (n) = 3 from Z to Z. Is this function one-to-one? Is this function onto? Justify [4] your answer. 13. Consider the function f(n)=5n-8 from Z to Z. Is this function one-to-one? Is this function onto? Justify [4] your answer. [4]