The buyer of a certain mechanical toy must choose 2 of 4 optional motions and 4

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问题 The buyer of a certain mechanical toy must choose 2 of 4 optional motions and 4 of 5 optional accessories. How many different combinations of motions and accessories are available to the buyer?

选项 A、8
B、11
C、15
D、20
E、30

答案 E

解析一购买机械玩具的顾客必须从4个可选择的机械装置中选择2个，且从5个附件中选择4个，问共有多少种不同机构装置和附件的组合可供这个顾客选择?
解：本题的正确答案为(E)。总的组合数为

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The buyer of a certain mechanical toy must choose 2 of 4 optional motions and 4

Acertainmayorhasproposedafeeoffivedollarsperdayonprivatevehiclese

Certainmessengermoleculesfightdamagetothelungsfromnoxiousairbytellin

Themostwidelyusedtherapyforacertaintypeofulcercompletelyhealssuchu

Acertaintypeofshrimphabituallyhoversaroundsuperheateddeep-seageysers,

Fromacertainfarmingregion,truckscancarryvegetablestomarketinNewMexi

Scientistshaverediscoveredcertainfoodcrops,oncecommonlycultivatedinthe

Notingthatthenumberofcrimescommittedinacertaincityhaddecreasedin19

Thetoxinproducedbycertainmarinesnailscontainsvariousproteins,oneofwh

Figuresissuedbythegovernmentofacertaincountryshowthatin1980thepubl

Inacertainmunicipality,ajudgeoverturnedasuspect’sconvictionforposses

Thefarmerwentouttowork.[br]Fromthepassage,wecanseethatthesonisr

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