conditional probability

3.1. Two fair dice are rolled. What is the conditional probability that at least one lands on 6 given that the dice land on different numbers? 3.2. If two fair dice are rolled, what is the conditional probability that the first one lands on 6 given that the sum of the dice is i? Compute for all values of i between 2 and 12. 3.3. Toustion (2 1) to 3 On- 3.4. What is the probability that at least one of a pair of fair dice lands on 6, given that the sum of the dice is i, i = 2,3, ..., 12