首页
登录
职称英语
A man has 53 socks in his drawer: 21 identical blue, 15 identical black and 17 i
A man has 53 socks in his drawer: 21 identical blue, 15 identical black and 17 i
游客
2023-10-16
15
管理
问题
A man has 53 socks in his drawer: 21 identical blue, 15 identical black and 17 identical red. The lights are fused and he is completely in the dark. How many socks must be taken out to make 100 percent certain he has a pair of black socks?
选项
答案
40 socks
解析
(这道题的意思是至少几次可取到一双黑袜子。假设在取第一只黑袜子时已将蓝色和红色的袜子全部取过,则第21+17+1=39只袜子是黑色,之后任取一只都可与之配成一双黑袜。所以答案为39+1=40只。)
转载请注明原文地址:https://www.tihaiku.com/zcyy/3101841.html
相关试题推荐
Yoursockdrawercontainstenpairsofwhitesocksandtenpairsofblacksocks.
Amanhas29socksinhisdrawer,9identicalblue,8identicalgreyand12iden
Amanhas53socksinhisdrawer:21identicalblue,15identicalblackand17i
Canyouspotwhichoftheknightsbelowareidenticaltwins?[img]2021m3x/ct_eyy
随机试题
[originaltext]M:I’dliketogototheStates,butifItookthejobthere,Iw
Afishermanandhiswife,wholivedalone,longedforachildoftheirown,
Bythetimewehurriedthroughtheheavytraffictotheairport,theplane_____
[originaltext]M:Hello.UniversityBocks.TimWeberspeaking.W:Hi.Tim,thisis
【B1】[br]【B7】A、signalB、gestureC、viewD、behaviorD空白处的内容应该与朋友的行为表现有关,因为下文随后指出它
作为接待人员,首先要掌握()。A.社交礼仪知识 B.社会常识 C.业务知识
包过滤防火墙是一种通过软件检查数据包以实现系统安全防护的基本手段,以下叙述中,不
患儿女,4岁。转移性右下腹疼痛伴寒战、发热、呕吐13小时。查体:T39.8℃,R
把下面的六个图形分为两类,使每一类图形都有各自的共同特征或规律,分类正确的一项是
在立法与司法实践中,行为人的所犯罪行与应当承担的刑事责任和接受的刑事处罚应当统一
最新回复
(
0
)