In an essay competition, the odds in favour of competitors P, Q, R S are 1:2, 1:3, 1:4, and 1:5 respectively. Find the probability that one  then win the competitions.

In a given race, the odds in favour of horses A, B, C, D are 1:3, 1:4, 1:5 and 1:6 respectively. Find the probability that one of the them wins the race.

In a given race , the odds in favour of horses A,B,C and D are 1 : 3 , ,1 : 4, 1 : 5 and 1 : 6 respectively. Find the probability that one of them wins the race .

In a given race, the odds in favourof horses, A,B,C,D are 1:3,1:4,1:5 and 1:6 respectively. Find the probability that one of the them wins the race.

In a given race,the odds in favour of horses A,B,C,D are 1:3,1:4,1:5,1:6 respectively. The probability that horse C wins the race is

In a given race the odds in favour of three horses A, B, C are 1 : 3, 1 : 4, 1 : 5 respectively. Assuming that dead head is impossible the probability that one of them wins is

In a horse race the odds in favour of three horses are 1 : 2, 1 : 3 and 1 : 4. The probability that one of the horse will win the race is