discrete maths

a How many edges does a graph with degree sequences 7,7,7,7,5,5,2 have? None of the others 33 38 20 O 40 Which of the following relations is the a partial ordering on the set A = {2,5,9}? {(2,2),(2,5),(5,9),(5,5),(9,9)} O {(2,2),(5,5),(9,9),(2,5),(5,9),(2,9) O {(2,2),(5,5),(5,9),(9,9), (9,5)} O {(2,2),(5,5),(2,9),(9,5),(9,9)} None of the others How many edges are there in a graph with 6 vertices each of degree 2 O 24 O 7 None of the others O 19 6 How many relations on the set A={1,3,11,12} contain the pairs (1,1),(3,1),(3,11) and (11,11) O 23 O 24 O None of the above O 26 212