Probability

Question

Tiles numbered 1 through 20 are placed in a box. Tiles numbered 11 through 30 are placed in a second box. One tile is randomly drawn from each box. Find each probability.

The first tile is odd and the second tile is less than 25.

Answer 1

1. Possible chances: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19; 
    Probability is 10/20 = 1/2
2. Possible events: 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11;
    Probability is 14/20 = 7/10