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
2024-08-12
12
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://tihaiku.com/zcyy/3716457.html
相关试题推荐
Amanhas53socksinhisdrawer:21identicalblue,15identicalblackand17i
Canyouspotwhichoftheknightsbelowareidenticaltwins?[img]2021m3x/ct_eyy
随机试题
Althoughhowlanguagebeganisstillapuzzle,whylanguagebeganseemsratherc
【B1】[br]【B7】[originaltext]Students’pressuresometimescomesfromtheirp
Natural-gasVehiclesKermittheFrogo
A.8 B.0 C.1 D.5
3岁男孩,自幼蹲位排尿,阴茎发育小,向下弯曲,尿道口位于阴茎根部与阴囊交界处,双
下列哪一种脉象只能做病脉出现A.滑脉 B.弦脉 C.数脉 D.迟脉 E.
A.水蒸气遇冷形成小冰晶是凝固现象 B.水蒸气遇冷形成小冰晶需要吸热 C.太
Y银行在其2020年度报告中披露,该行一天中99%的Var值为5000万元人民币
可以用来衡量职业生涯管理的有效性的标准有()。A.是否达到个人或组织目标及程度
项目监理机构全面开展建设工程监理工作的指导性文件是( )。A.监理实施细则 B
最新回复
(
0
)