Suppose A = {1, 2, 3} and B = {1, 2, 3, 4, 5, 6}.
a. Find A ∩ B.
b. Find A ∪ B.
c. In general, if E ∩ F = E, what must be true concerning sets E and F?
d. In general, if E ∪ F = F, what must be true concerning sets E and F?
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