1. Jack dipped into the bag, and pulled out a red poker chip. “The odds were 5 to 2 against red,” Mike told him. “They would have been 2 to 1 against a green chip.” “All right,” said Jack. “I know you have only the three colours in there. What were the odds against my drawing a blue?” Well?

Odds 13 to 8 against blue

Odds 12 to 5 against blue

Odds 10 to 3 against blue