9. A relation R on a set A is asymmetric if and only if when aRb, then bRa. 14 A. True B. False A. 10. Which of the following best characterizes the relation on N given by aRb - alb? C. A. symmetric B. reflexive C. transitive D. both B and C 11. Let A = {1,2,3,4,5}. Write the relation corresponding to the following digraph: 5 A. {(1,3), (1,5), (2,1), (5,3)} B. {(3,1), (5,1), (1,2), (3,5) } C. {(1,3), (1,5), (2,1), (4,4), (5,3)} D. {(1,3), (1,5), (2,1), (2,5), (5,3)} 12. Which of the following is true? A. 7 = 10 mod 4 B. 35 = 7 mod 7 C. 12 = 20 mod 9 D. None of these is correct