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标题: 2道数学题
real_arsen_ac
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发表于 2008-7-22 22:20  资料 短消息 
2道数学题

The probability is 1/2 that a certain coin will turn up heads on any given toss. If the coin is to tossed 3 times, what is the probability that on at least one of the tosses the coin will turn up tails?
a.1/8 b.1/2 c.3/4 d.7/8 e.15/16
答案是d.7/8

In a nationwide poll, N people were interviewed. If 1/4 of them answered yes to question 1, and of those, 1/3 answered yes to question 2, which of the following expressions represnets the number of people interviewed who did not answer yes to both questions?
a.N/7 b.6N/7 c.5N/12 d.7N/12 e.11N/12
答案是e.11N/12
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Tyliayss (小猪)
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发表于 2008-7-22 22:38  资料 短消息 
1. 1-1/2*1/2*1/2




Some birds are not meant to be caged, that's all. Their feathers are too bright, their songs too sweet and wild. So you let them go, or when you open the cage to feed them they somehow fly out past you. And the part of you that knows it was wrong to imprison them in the first place rejoices, but still, the place where you live is that much more drab and empty for their departure.
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想起你时,想起了幸福
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real_arsen_ac
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发表于 2008-7-23 10:16  资料 短消息 
楼上能稍微解释一下吗?谢谢!
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minami242 (南)
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发表于 2008-7-23 12:05  资料 短消息 
就是把三次都得到tail的几率减去。

哪位能回答一下我关于gmat笔试模考自己怎么算分的问题?
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Tyliayss (小猪)
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发表于 2008-7-23 21:51  资料 短消息 
好像OG黄本后面有算分办法的吧。。。。




Some birds are not meant to be caged, that's all. Their feathers are too bright, their songs too sweet and wild. So you let them go, or when you open the cage to feed them they somehow fly out past you. And the part of you that knows it was wrong to imprison them in the first place rejoices, but still, the place where you live is that much more drab and empty for their departure.
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想起你时,想起了幸福
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lykid1987
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发表于 2008-8-12 09:25  资料 短消息 
2。题目意思是没有两题都回答yes(both是部分否定的)
N*(1-1/3*1/4)
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aiwen6
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发表于 2008-8-19 15:47  资料 短消息 
。。。。。。。。
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