a. Is 3 ∈ {1, 2, 3}?
b. Is 1 ⊆ {1}?
c. Is {2} ∈ {1, 2}?
d. Is {3} ∈ {1, {2}, {3}}?
e. Is 1 ∈{1}?
f. Is {2} ⊆ {1, {2}, {3}}?
g. Is {1} ⊆ {1, 2}?
h. Is 1 ∈{{1}, 2}?
i. Is {1} ⊆ {1, {2}}?
j. Is {1} ⊆ {1}?
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