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the following are true statements? 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}} solution: Only (a), (d), and (f) are true. For (b) to be true, the set {1, 2, 3} would have to contain the element {2}. But the only elements of {1, 2,