counting2

# B all are the same color c exactly two of the balls

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(a) All of the balls are to be red? (b) All are the same color? (c) Exactly two of the balls are the same color? (d) There are more red balls than green balls? 15. A box contains two red, four green, six black, and three blue balls. In how many ways can a sample of four balls be selected if (a) Exactly three of the balls are the same color? (b) Exactly one red ball and at least one green ball is drawn? (c) At most two blue balls are drawn? (d) There are more red balls than green balls? 16. Ten cards are to be selected from a deck of 52 cards. In how many ways can this be done if (a) At least 2 are to be spades? (b) At least 3 are to be spades? 17. A box contains 12 red, 8 green, and 20 blue marbles. How many different samples of 8 marbles may be selected if (a) At least 3 are green? (b) All are to be green? 18. Nine people are to travel to dinner in a five-seater van and a four-seater sports car. (a) How many different groups of five and four are possible for the trip? (b) How many different seating arrangements are possible if two persons, Juanita and Kareem, are designated drivers and the others can sit in any of the remaining seats? 19. How many ways can 3 A’s and 6 B’s be placed in a row if the A’s are not next to each other? 20. In how many ways can 7 people be seated around a circular table?

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• Spring '08
• JillZarestky
• Counting, Primary color, Space Shuttle Columbia, STS-121

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