The answers to exercise marked [BB] can be found in the Back of the Book.
Determine whether each of the following relations is a function with domain {1, 2, 3, 4}. For any relation that is not a function, explain why it isn't.
(a) [BB] ƒ = {(1,1), (2,1), (3, 1), (4, 1), (3,3)}
(b) ƒ = {(1, 2), (2, 3), (4, 2)}
(c) [BB] ƒ = {(1,1), (2, 1), (3,1), (4, 1)}
(d) ƒ = {(1, 1), (1, 2), (1, 3), (1,4)}
(e) ƒ ={(1,4), (2, 3), (3, 2), (4,1)}
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