首页
登录
职称英语
[img]2022m10x/ct_ve01204002j_0001_221018[/img]The map above shows the trails t
[img]2022m10x/ct_ve01204002j_0001_221018[/img]The map above shows the trails t
游客
2024-01-13
52
管理
问题
The map above shows the trails through a wilderness area. If travel is in the direction of the arrows, how many routes along the marked trails are possible from point A to point 8?
选项
A、11
B、18
C、54
D、108
E、432
答案
C
解析
It is clear that the number of routes from point A to point B that begin by going up from point A ("up" relative to the orientation of the map) is the same as the number of routes from point A to point B that begin by going down from point A. Therefore, we only need to determine the number of routes from points to point B that begin by going up and then double the result.
To determine the number of routes that begin by going up from point A,we can apply the Multiplication Principle. There are 3 locations at which branches occur. Moreover, at each of these locations, there are 3 different trails that can be taken. Finally, the choices of which trail to take at each location can be made independently. Therefore, the Multiplication Principle applies and we get (3)(3)(3) = 27 for the number of routes that begin by going up from point A. Hence, the number of routes from point A to point B is 2(27) = 54.
The correct answer is C.
转载请注明原文地址:https://tihaiku.com/zcyy/3360146.html
相关试题推荐
Ifa◇bisdefinedas[img]2022m10x/ct_ve01203002m_egmatqchoose_0011_221020[/im
Whatisthevalueofx?(1)x4+x2+1=[img]2022m10x/ct_ve01204002j_0044_22101
Ifn>4,whatisthevalueoftheintegern?[img]2022m10x/ct_ve01204002j_0284_
[img]2022m10x/ct_ve01204002j_0014_221018[/img]Thefigureaboverepresentsanet
IntheformulaW=[img]2022m10x/ct_ve01204002j_0013_221018[/img],integersPandt
IfN=[img]2022m10x/ct_ve01204002j_0011_221018[/img],whereT=K/5andx=5-
[img]2022m10x/ct_ve01204002j_0009_221018[/img]Acertainmanufacturerusesthef
[img]2022m10x/ct_ve01204002j_0007_221018[/img]Thetableaboveshowstheaverag
[img]2022m10x/ct_ve01204002j_0059_221018[/img]Inthefigureabove,segments[im
[img]2022m10x/ct_ve01204002j_0057_221018[/img]Thefigureaboveshowsthedimens
随机试题
B语言学概念的实例分析。Semanticallydifferentsynonyms意为“语义不同的同义词”,指语义相近但是略有不同的几个单词。
Theaffixinthewordspeakingisa(n)______.A、derivationalsuffixB、inflectiona
车辆检测的方法有()。A.磁性检测 B.超声检测 C.电磁波检测 D
一般调查表均包括几个部分,即封面信、指导语、问题、答案、编码等。( )
下列对企业现金和银行存款的管理的说法,正确的是( )。A.银行账户的开立应当符
风险对策应形成的风险管理计划,其内容包括风险管理的目标、范围、方法、工具和下列选
2020年11月份,社会消费品零售总额39514亿元,同比增长5.0%,增速同比
赵某死亡,遗产由其父甲、其母乙、其妻丙和其子丁继承,当时丙已怀孕。上述继承人在继
甲对某危害结果没有阻止其发生的义务,如果该危害结果发生,甲的不作为行为A.不可能
根据《标准施工招标文件》中通用条款规定,承包人通常只能获得工期补偿,但不能得到费
最新回复
(
0
)