a) Không gian mẫu Ω={(1,2); (1,3); (1,4); (1,5); (2,3); (2,4); (2,5); (3,4); (3,5); (4,5)}
b) A={(1,3); (1,5); (2,4)}
B={(1,2); (2,3); (2,4); (2,5); (4,1); (4,3); (4,5)}
C1A HỢP B={(1,3); (1,5); (1,2); (2,3); (2,4); (2,5); (4,1); (4,3); (4,5)}
C2A GIAO B={(2,4)}