1. When a pair of dice is rolled, what is the probability that the sum of the dice is 8, given that the outcome is not 7?
2. When a pair of dice is rolled, what is the probability that the sum of the dice is 5, given that exactly one of the dice shows a 3?
3. A coin is tossed three times. What is the probability that the outcome is three heads, given that exactly one of the coins shows a head?