The answers to exercises marked [BB] can he found in the Back of the Book.
Let A = {(−1,2), (4,5), (0,0), (6, −5), (5, 1), (4, 3)}. List the elements in each of the following sets.
(a) [BB] [a + b \ (a, b) ∈ A}
(b) {a | a > 0 and (a, h) ∈ A for some b}
(c) [h | b = k2 for some k ∈ Z and (a, b) ∈ A for some a}
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