1 . Perhatikan relasi berikut!(i) { (1, a), (2, a), (3, a), (4, a) }(ii) { (2, b), (3, c), (4, d), (2, e) }(iii) { (3, 6), (4, 6), (5, 10), (3, 12) }(iv) { (1, 5), (3, 7), (5, 9), (3,...