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Question

The odds against A solving the problem are 4 to 3 and the odds in favour of B solving the problem are 7 to 5. Find the probability that the problem will be solved.

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Solution

Probability of A does not solve the problem = 47 ...A
Probability of A solves the problem = 37 ...A


Probability of B does not solve the problem = 512

Probability of B solves the problem =712

Probability that the problem get solved =47×712+37×512+37×712
=6484=1621

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