解:因为解:连续抛两枚骰子分别得到的点数是a,b的情形共有36种: (1,1),(1,2),(1,3),(1,4),(1,5),(1,6), (2,1),(2,2),(2,3),(2,4),(2,5),(2,6), (3,1),(3,2),(3,3),(3,4),(3,5),(3,6), (4,1),(4,2),(4,3),(4,4),(4,5),(4,6), (5,1),(5,2),(5,3),(5,4),(5,5),(5,6), (6,1),(6,2),(6,3),(6,4),(6,5),(6,6), 而向量(a,b)与向量(1,-1)垂直,只需满足a=b,共有6种情况: (1,1),(2,2),(3,3),(4,4),(5,5),(6,6).因此概率值为选B |