October 2018 1 30 Report
1. {(1,a),(2,a),(3,a),(4,a)}
2. {(1,a),(1,b),(1,c),(1,d)}
3. {(1,a),(2,a),(3.b),(4,b)}
4. {(1,a),(2,b),(1,c),(2,d)}

yang merupakan fungsi adalah ...
A. (1) dan (2)
B. (1) dan (3)
C. (2) dan (3)
D. (2) dan (4)

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