A set of dominoes (多米诺) consists of rectangular (矩形的) tiles each carrying two numbers from 0 to 6 which represented by patterns

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问题 A set of dominoes (多米诺) consists of rectangular (矩形的) tiles each carrying two numbers from 0 to 6 which represented by patterns of spot. Every possible pairing of numbers occurs just once, including each number with itself.
How many dominoes are there in a set?

选项

答案28

解析

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本试题收录于： C类竞赛（非英语专业本科）题库大学生英语竞赛（NECCS）分类

C类竞赛（非英语专业本科）

大学生英语竞赛（NECCS）

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A set of dominoes (多米诺) consists of rectangular (矩形的) tiles each carrying two numbers from 0 to 6 which represented by patterns

C类竞赛（非英语专业本科）

大学生英语竞赛（NECCS）

WaterforLifeWaterisessentialforlife.Yetmanymillionsofpeoplearoundtheworldfaceawater【C1】______(short).Man

Bicyclesharinghasbeenahotlydebatedtopicoverthepasttwoyears.BicyclesarenothingexotictoChinesepeople.Inthe19

In1932,______thedepression,theAmericanpeoplechoseFranklinD.Rooseveltastheirnextpresidentwhopromiseda"newdeal

Determinewhatnumbershouldreplacethequestionmark:16424325612536?

DictationListentothepassage.Forquestions21—25,fillintheblankswiththeexactwordsorphrasesyouhear.Whatdoyoud

Hemingway’sfirstnoveltellsofthesadnessand______ofyoungAmericanslivinginParisafterWorldWarI.

Turninyourcollectionofindustry-suppliedfreebiesandGoodmanwillsendbackafewreplacementpensbearingtheNoFreeLunc

Michelangelodesignedmanybuildings,but______washisworkatSt.Peter’sBasilica______representedhisgreatestachievementa

Ipromisedto______herdaughternextweekwhenshe’sonbusiness.

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关于公示及公示方式的表述，正确的有()。

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