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

游客2025-02-24 1

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

Thebuyerofacertainmechanicaltoymustchoose2of4optionalmotionsand4

Aresearchscientistwantstostudyacertainattributeofdogs.Itisestimated

Thealtitudeofacertaintriangularsailis2metersgreaterinlengththanits

Acertainmoneymarketaccountthathadabalanceof$48,000duringalloflast

Acertainrectanglehasperimeter54.Iftheratioofthelengthoftherectangl

Thescoresreportedforacertainmultiple-choicetestwerederivedbysubtracti

Thecost,indollars,foranappliancerepairatacertaincompanyis1.2p+20h

Inacertainroom,allexcept18ofthepeopleareover50yearsofage.If15o

Theoddsthatacertaineventwilloccuristheratiooftheprobabilitythatth

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Eacheducationalsystemisnotperfectinastrictsense,whichhasits______.A、

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