Four roads away from the country jail.
A prisoner has escaped from the jail and selects the road at random.
If road 1 is selected, the probabiltiy of escaping 1/8. if road 2 is selected , the probability of success is 1/6. if road 3 is selected, the probability of escaping is 1/4 and if road 4 is selected, the probability of succes is 9/10
if the prisoner succeed, what is the probability that the prisoner escaped by using road 4? By using road 1?