18. A box contains four $10 bills, six $5 bills and two $1 bills. Two bills are taken at

random from the box without replacement. What is the probability that both bills will be

of the same denomination?

19. Mr. Flowers plants 10 rose bushes in a row. Eight of the bushes are white and two are

red, and he plants them in random order. What is the probability that he will

consecutively plant seven or more white bushes?

20. If we randomly pick two television sets in succession from a shipment of 240

television sets of which 15 are defective, what is the probability that they will both be

defective?

21. Two people take turns rolling a fair die. Person X rolls first, then person Y then X, and

so on. The winner is the first to roll a 6. What is the probability that person X wins?

22. A pair of dice consisting of a six-sided die and a four-sided die is rolled and the sum is

determined. Let A be the event that a sum of 5 is rolled and let B be the event that a sum

of S or a sum of 9 is rolled. Find (a) P(A), (b) P(B), and (c) P(A \ B).

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