Question

The odds in favour
of standing first of three students Aman, Rahul and Vijay appearing at an examination are 1:2,
2:5 and 1:7 respectively. What is the probability that either of them will stand first.

Answer 1

Answer:

The odds (in favor) of an event or a proposition is the ratio of the probability that the event will happen to the probability that the event will not happen

So, required probability = P(First person standing first) + P(Second person standing first) + P(Third person standing first)

= 1/(1+2) + 2/(2+5) + 1/(1+7)

= 1/3 + 2/7 + 1/8

= (56 + 48 + 21)/168

= 125/168

Step-by-step explanation:

hope it should be correct