When playing bingo, 50 balls are placed in a bin and balls

Last updated: 7/9/2022

When playing bingo, 50 balls are placed in a bin and balls are selected at random. Each ball is marked with a letter and number as indicated in the chart below. For example, there are balls marked B1, B2, up to B10; I11, I12, up to 120; and so on. Assume one bingo ball is selected at random. What is the probability it has the letter O on it? (Type a fraction. Simplify your answer.)