9. (5 pts) True-False: which of the following are true? a. 2 ∈{1,2,3} b. {2} ∈ {1,2,3} c. 2 ⊆ {1,2,3} d. {2} ⊆ {1,2,3} e. {2} ⊆{{1},{2}} f. {2} ∈ {{1},{2}} 10. (5 pts) If Z represents allintegers, and Z+ represents the positive integers, then let A = Z+,B = {n ∈ Z|0 ≤ n ≤ 100}, and C = {100,200,300,400,500}. Which ofthe following are true? a. C ⊆ B b. C is a proper subset of A c. Cand B have at least one element in common d. B ⊆ A e. C ⊆ C 11. (5pts) Let
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