tailieunhanh - problems practice phần 7

Tham khảo tài liệu 'problems practice phần 7', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 5. Barbara has 8 shirts and 9 pants. How many clothing combinations does Barbara have if she doesn t wear 2 specific shirts with 3 specific pants a b c d e 41. 66. 36. 70. 56. 6. A credit card number has 6 digits between 1 to 9 . The first two digits are 12 in that order the third digit is bigger than 6 the forth is divisible by 3 and the fifth digit is 3 times the sixth. How many different credit card numbers exist a b c d e 27. 36. 72. 112. 422. 7. In jar A there are 3 white balls and 2 green ones in jar B there is one white ball and three green ones. A jar is randomly picked what is the probability of picking up a white ball out of jar A a b c d e 2 5. 3 5. 3 10. 3 4 2 3. 8. Out of a box that contains 4 black and 6 white mice three are randomly chosen. What is the probability that all three will be black a 8 125. b 1 30. c 2 5. d 1 720. e 3 10. 9. The probability of pulling a black ball out of a glass jar is 1 X. The probability of pulling a black ball out of a glass jar and breaking the jar is 1 Y. What is the probability of breaking the jar a 1 XY . b X Y. c Y X. d 1 X Y . e 1 x-Y . 10. Danny Doris and Dolly flipped a coin 5 times and each time the coin landed on heads . Dolly bet that on the sixth time the coin will land on tails what is the probability that she s right a 1. b . c . d . e 1 3. 11. In a deck of cards there are 52 cards numbered from 1 to 13. There are 4 cards of each number in the deck. If you insert 12 more cards with the number 10 on them and you shuffle the deck really good what is the probability to pull out a card with a number 10 on it a 1 4. b 4 17. c 5 29. d 4 13. e 1 3. 12. There are 18 balls in a jar. You take out 3 blue balls without putting them back inside and now the probability of pulling out a blue ball is 1 5. How many blue balls were there in the beginning a b c d e 9. 8. 7. 12. 6. 13. In a box there are A green balls 3A 6 red balls and 2 yellow ones. If there are no other colors what is the probability of taking out a green

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