If two dice are rolled once and one die rolled a second time if the first two rolls have same number, what is the probability of getting a sum of 14?
Work backwards, then determine the probabilities
If the sum is 14, then possible values for the second roll (given that the first two are equal) and the value of the first rolls:
(First double, Second single)
P(two 6's then a 2)
Same probability for the other two outcomes.
hope that helped