Himpunan pasangan berikut ini merupakan pemetaan, kecuali... (jelaskan)
a. {(1,a), (2,b), (3,c), (4,d)}
b. {(1,a), (2,c), (3,d), (4,b)}
c. {(1a), (2,a), (3,a), (4,a)}
d. {(1,a), (1,b), (2,c), (4,d)}
a. {(1,a), (2,b), (3,c), (4,d)}
b. {(1,a), (2,c), (3,d), (4,b)}
c. {(1a), (2,a), (3,a), (4,a)}
d. {(1,a), (1,b), (2,c), (4,d)}
,,,,