1. If three cards are drawn without replacement from an ordinary deck, find the probability that the third card is a heart, given that the first two cards were hearts.

2. Two fair dice are rolled. The sum of the numbers on the dice is 6 or 9.

3. Assume that 2 marbles are drawn without replacement from a box with 1 blue, 3 white, 2 green, and 2 red marbles. Find the probability of the indicated result:

a. The second marble is white, given that the first marble is blue.

b. The second marble is blue, given that the first marble is white.

If you could explain, then I can answer my remaining 30 questions.

Thanks in advance.