The odds against ram solving the problem are 4 to 3 and the odds in favour of krishna solving the same are 6 to 5. What is the chance that it will be solved when they both try?
Choose the correct choice.
A) 1/4 B) 5/21 C) 16/21 D) 23/28 E) 57/77
Odds against Ram are 4:3 so probability that he will solve the problem is 3/7.   Odds in favor of Krishna are 6:5 so probability that he will solve it is 6/11   It will be solved means that either Ram or Krishna or both will be able to solve it.   P(A or B) = P(A) + P(B) - P(A and B) = 3/7 + 6/11 - (3/7)*(6/11) = 57/77   57/77
<result>E</result>
The odds against ram solving the problem are 4 to 3 and the odds in favour of krishna solving the same are 6 to 5. What is the chance that it will be solved when they both try?