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There are 20 chairs in a room numbered 1 through 20. If eight girls and 12...

There are 20 chairs in a room numbered 1 through 20. If eight girls and 12 boys sit on these chairs at random. Find the probability that (a) the thirteenth chair is occupied by a boy? (b) the girls are together. (c) the boys are together and the girls are together?

Math   Statistics-And-Probability   
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