The answers to exercises marked [BB] can be found in the Back of the Book.
(a) List all the subsets of the set {a, b, c, d} that contain
i. four elements;
ii. [BB] three elements;
iii. two elements;
iv. one element;
v. no elements;
(b) How many subsets of {a, b, c, d} are there altogether?
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