There are 5 competitors in a race (John, mary and 3 other ones) in which there are no ties, what is the probability that mary finish ahead of john?
Select: A) 1/6 B) 1/3 C) 1/2 D) 2/3 E) 5/6
Mary has equal chances of finishing ahead of John as John has chances of finishing ahead of mary   But, Probability for Mary finishing ahead of John + Probability for John finishing ahead of Mary = 1   Hence Probability for Mary finishing ahead of John = 1/2   Answer: Option 1/2
<result>C</result>
There are 5 competitors in a race (John, mary and 3 other ones) in which there are no ties, what is the probability that mary finish ahead of john?