GMAT数学 GMAT数学之概率大成篇

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times. What is the probability that the coin will land tails side up more than five times?

16. A box contains 3 yellow balls and 5 black balls. One by one, every ball is selected at random without replacement. What is the probability that the fourth ball selected is black?

17. The oasis output of Abu Ilan in the heart of the Negev desert, has a population of 20 Bedouin tribesmen and 20 Farma tribesmen. El Kamin, a nearby oasis, has a population of 32 Bedouin tribesmen and 8 Farima tribesmen. A lost soldier (from another country), accidentally seperated from his army unit, is wandering through the desert and arrives at the edge of one of the oases. The soldier has no idea which oasis he has found, but the first person he spots from a distance is a Bedouin. What is the probability that he wandered into Abu Illan? What is the probability that he is in El Kamin?

18. A man can hit a target once in 4 shots. If he fires 4 shots in succession, what is the probability that he will hit target

19. In his pocket, a boy has 3 red marbles, 4 blue marbles, and 4 green marbles. How many will he have to take out of his pocket to ensure that he has taken out at least one of each color?

20.a jar contains only x black balls and white balls. One ball is drawn randomly from the jar and is not replaced. A second ball is then drawm randomly from the jar. What is the probability that the first ball drawn is black and the second ball drawn is white?

21.4对夫妇，从中任意选出3人组成一个小组，不能从任一对夫妇中同时选择两人。问符合条件的概率是多少？

22.从6双不同的手套中任取4只，求其中恰有一对配对的概率?

23.3个打字员为4家公司服务，每家公司各有一份文件录入，问每个打字员都收到文件的概率?

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Last Sunday a certain store sold copies ofNewspaper A for $1.00 each and copies of Newspaper B for $1.25 each, and thestore sold no other newspapers that day. If r percent of the store’s revenuesfrom newspaper sales was from Newspaper A and if p percent of the newspapersthat the store sold were copies of newspaper B, which of the followingexpresses r in terms of p?

A. 100p / (125 – p) B. 150p / (250 – p) C. 300p / (375 – p) D. 400p / (500 – p) E. 500p / (625 – p)

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