18. Five mark exercise problem VI

The probability that a person will get an electrification contract is \(\frac{3}{5}\) and the probability that he will not get plumbing contract is \(\frac{5}{8}\). The probability of getting atleast one conract is \(\frac{5}{7}\). What is the probability that he will get both?

 

Answer:

 

The required probability is $\frac{i}{i}$