question_answer

A is one of 6 horses entered for a race and is to be ridden by one of two jockeys B and C. It is 2:1 that B rides A, in which case all the horses are equally likely to win. If C rides A, his chance of winning is trebled. What are the odds against winning of A?

A)  5 : 18              

B)  5 : 13

C)  18 : 5              

D)  13: 5

E)  None of these