In a box of 10 electrical parts, 2 are defective. (a)If you choose one part at random from the box, what is the probability that

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问题 In a box of 10 electrical parts, 2 are defective.
(a)If you choose one part at random from the box, what is the probability that it is not defective?
(b)If you choose two parts at random from the box, without replacement, what is the probability that both are defective?

选项

答案(a)4/5(b)1/45

解析

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In a box of 10 electrical parts, 2 are defective. (a)If you choose one part at random from the box, what is the probability that

GRE QUANTITATIVE

GRE

IfthereisonethingI’msureabout,itisthatinahundredyearsfromnowwewillstillbereadingnewspapers.Itisnottha

Theunderlinedword"average"inParagraph1means______.WhichofthefollowingstatementsisTRUEaccordingtoParagraph2?

Now,commercialfarmershavebecomeincreasingly______sothatalmosteverythingconsumedonmostfarmsisnowboughtfromouts

Weallknowthatitispossibleforordinarypeopletomaketheirhomesontheequator,althoughoftentheymayfeeluncomfortab

Ifxisapositive,single-digitintegersuchthat4x/3,2x,x,andx+2,and3x-2formanon-orderedlistofconsecutiveintegers

Ifthetemperaturedecreases30percentfrommdegreesto49degrees,thenm-49=?

Fiveredballsandtwoblueballsareplacedinallemptybox.Oneballatimeistobeselectedrandomlyandremoved4ballsfr

Inthecoordinateplane,pointsAandBareendpointsofadiameterofacirclewithcenter(-2,1).IfthecoordinatesofAare

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对某处理后的复合地基进行现场竖向抗压载荷试验，实测得三个测点的复合地基承载力特征值分别为：170kPa、178kPa、184kPa。试问，该复合地基承载力特征值(kPa)应为下列()项。

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