The 4 beads in a bag are identical except that 2 are red and 2 are blue. If 2 beads are to be simultaneously and randomly select

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问题 The 4 beads in a bag are identical except that 2 are red and 2 are blue. If 2 beads are to be simultaneously and randomly selected, what is the probability that they will both be blue?

选项 A、1/6
B、1/4
C、1/3
D、1/2
E、5/6

答案A

解析一个袋子中有4个相同的珠子，其颜色为2红2蓝。若同时随机地取出2个珠子，问这两个珠子同为蓝色的概率是多少?
解：本题的正确答案为(A)。第一个珠子为蓝色的概率是2/4，第二个仍为蓝色的概率是1/3，所以两个同为蓝色的概率是：P=2/4×1/3=1/6

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The 4 beads in a bag are identical except that 2 are red and 2 are blue. If 2 beads are to be simultaneously and randomly select

GRE QUANTITATIVE

GRE

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Imagineaschoolthatexpecteditsstudentstobecomeliteratewithoutanyformalinstruction.Mostparentswouldbealarmedby

Fromthenon,asoundsystemofPartyCommitteemeetingswas______inallleadingbodies.

Thebirthrateinacity______tofallasitsgrossdomesticproduct(GDP)risessteadily.

Normallyastudentmustattendanumberofcoursesinordertograduate,andeachcoursewhichheattendsgiveshimagradewhic

Whatdoestheauthormeanbysaying"theyknowbetternow?"Whichofthefollowingstatementsistrueaccordingtothepassage?

JustasProfessorScottioften______it,successisninety-ninepercentmentalattitude.

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钱钟书，中国现代著名______、______。代表作品有长篇小说______，短篇小说集______，散文集______，学术著作______、______等。他的小说和散文都具有机智隽永的独特风格，其学术论著在国内外学术界享有很高声誉。

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