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）

Bicyclesharinghasbeenahotlydebatedtopicoverthepasttwoyears.BicyclesarenothingexotictoChinesepeople.Inthe19

Bicyclesharinghasbeenahotlydebatedtopicoverthepasttwoyears.BicyclesarenothingexotictoChinesepeople.Inthe19

Whenwethinkofgoodhealth,wealmostalwaysthinkabouteatinggoodfoodanddoingexercise.However,gettingenoughsleepan

Theopeningofyourpresentationisyourfirstopportunitytomeettheprospectfacetoface.Itisthemostimportantpartofy

Theopeningofyourpresentationisyourfirstopportunitytomeettheprospectfacetoface.Itisthemostimportantpartofy

FollowingthewarmreceptionoftheEnglishversionofPeople’sLiterature,alandmarkmagazine【C1】______(record)contemporaryC

Inrecentyears,Chinesefancyknotshavebecomeverypopular.(81)Theyarehand-madeornamentsnotedfortheirpatternsandbr

WhenDavidistwiceasoldasheisnowhewillbefourtimesasoldashisdaughterJanewillbeinfiveyearstime.Ifin1990

在Word[格式]工具栏上的段落对齐方式按钮分别为()。

石油沥青防腐作业线的工艺流程为上管、除锈、除尘、浇涂缠绕、检验和堆放。

蛋白质分子中的疏水键

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农村信用社对农户发放贷款利率的最高上限为中国人民银行规定的基准利率的()倍。

奥苏伯尔根据学习进行的方式把学习分为()。

Withtheworld’spopulationestimatedtogrowfromsixtoninebillionby2050,researchers,businessesandgovernmentsarealre

Spanishwomen______just4.1%ofcorporateboards,accordingtoastudybytheEuropeanProfessionalWomen’sNetwork.

Childrenwholivenearamainroadareingreaterdangerofcatchingpneumonia(肺炎)becausepollutionfrompassingtrafficdamag