1. An urn has two white and three green balls. A number is selected at random from 1; 2; 3; 4; 5, and then that many balls are taken out from the urn. Find the probability that they are all green.
2. An urn has five white and five green balls. Five balls are drawn at random without replacement. Find the probability that in each odd-numbered draw a green ball is drawn.
3. On a table, there are two dice. One is a fair die, and the faces of the other die are 1, 1, 2, 2, 6, 6. One die is selected at random and rolled, and it gives a six. What is the probability that it was the fair die?