首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Pat will walk from intersection X to intersection Y along a route that is confined to the square grid of four streets and three
Pat will walk from intersection X to intersection Y along a route that is confined to the square grid of four streets and three
admin
2022-10-18
80
问题
Pat will walk from intersection X to intersection Y along a route that is confined to the square grid of four streets and three avenues shown in the map above. How many routes from X to Y can Pat take that have the minimum possible length?
选项
A、Six
B、Eight
C、Ten
D、Fourteen
E、Sixteen
答案
C
解析
Each minimum-length route will consist of traveling a total of 3 grid segments up and 2 grid segments right. Thus, letting ’U’ represent traveling up by one grid segment and ’R’ represent traveling right by one grid segment, each minimum-length route can be uniquely represented by an appropriate 5-character string of U’s and R’s. For example, URUUR represents grid segments traveled in the order up, right, up, up, and right. Therefore, the number of possible minimum-length routes is equal to the number of appropriate 5-character strings of U’s and R’s, which is
86,since each appropriate string is determined when a specification is made for the 3 positions in the string at which the U’s are to be placed.
The correct answer is C.
转载请注明原文地址:https://kaotiyun.com/show/TttO777K
本试题收录于:
GMAT QUANTITATIVE题库GMAT分类
0
GMAT QUANTITATIVE
GMAT
相关试题推荐
SpeakerA:Hello,Iwanttobuysomeclothesformygirlfriendforherbirthdaypresent.SpeakerB:Noproblem,sir.【D8】______
Theseplasticflowerslookso______thatmanypeoplethinktheyarereal.
WhatdowemeanbyaperfectEnglishpronunciation?Inone【C1】______therearemanydifferentkindsofEnglishastherearespeak
Whatheis______isneithermoneynorfame,butthesatisfactionofseeinghisstudentsgrowupasbuildersofsocialism.
TheChinesehaveusedamethodcalledacupuncturetohelpperformoperationsforabout4,000yearswithoutputtingthepatient
The______oftelephonehasbroughtmuchconveniencetopeoplearoundtheworld.
Thegovernmentisdeterminedto______anendtoinflation.
Hewasamanoffinecharacterinallpoints______hewasrathertimid.
Exactly3depositshavebeenmadeinasavingsaccountandtheamountsofthedepositsare3consecutiveintegermultiplesof$7
Anthropologywasmuchmorethan______forthenovelistZoraNealeHurston:shestudiedatBarnardCollegewithFranzBoas,whoi
随机试题
肝尾叶的静脉引流入下列哪条静脉
A.突发性耳聋B.老年性耳聋C.听神经瘤D.梅尼埃病E.药物中毒性聋根据下列病历简介,最可能的诊断是患者男性,45岁,左耳聋1年逐渐加重,检查双鼓膜完整,电测听左耳神经聋,ABR示蜗后聋
母亲带1岁男孩来院体查,经检查该小儿体格发育正常。其体重可达
作为寻找腭大孔的标志的牙是
某建设项目采用以纵向工作部门指令为主的矩阵组织结构(见图1),其优点是可以()。
应由监理工程师(建设单位项目技术负责人)组织进行验收的是()质量验收。
关于基金产品风险评价应当依据的因素,表述错误的是()。
数学老师讲课很生动,激发了小红认真学好数学的兴趣,这属于()。
娱乐:评书
某甲参加特务组织后,受敌派遣,多次在其父处窃得军事情报交给特务组织。其后,某甲又策动其父武装叛乱。某甲的行为构成()。
最新回复
(
0
)