College Mathematics

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(odds) Playing Bingo:When playing bingo, 75 balls are placed in a bin and balls are selected at random. Each ball is marked with a letter and a number as indicated in the following chart: B: 1-15
I: 16-30 N:31-45 G:46-60 O:61-75. For example there are balls marked B1,B2 up to B15; I16, I17, up to 30 and so on. Assuming one bingo ball is selected at random, determine the probability that it does not contain the letter G.

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