首页
登录
职称英语
Ben and Ann are among 7 contestants from which 4 semifinalists are to be selecte
Ben and Ann are among 7 contestants from which 4 semifinalists are to be selecte
游客
2024-01-13
31
管理
问题
Ben and Ann are among 7 contestants from which 4 semifinalists are to be selected. Of the different possible selections, how many contain neither Ben nor Ann?
选项
A、5
B、6
C、7
D、14
E、21
答案
A
解析
The number of possible selections of 4 semifinalists that do not contain Ben or Ann is equal to the number of possible selections of 4 semifinalists from the remaining 7-2 = 5 contestants, which is equal to
. Alternatively, the number of possible selections of 4 semifinalists from the remaining 5 contestants is equal to the number of possible selections of exactly 1 non-semifinalist, which is equal to 5.
The correct answer is A.
转载请注明原文地址:https://tihaiku.com/zcyy/3360156.html
相关试题推荐
Ifathree-digitnumberisselectedatrandomfromtheintegers100to999,incl
BenandAnnareamong7contestantsfromwhich4semifinalistsaretobeselecte
Oneintegerwillberandomlyselectedfromtheintegers11to60,inclusive.Wha
Ifanintegerisrandomlyselectedfromallpositive2-digitintegers,whatist
Atalentcontesthas8contestants.Judgesmustawardprizesforfirst,second,
Atalentcontesthas8contestants.Judgesmustawardprizesforfirst,second,
Supposexandyareselectedrandomlyfromtheset{1,2,3,4,5}andtheycan
Fourdifferentpersonswillbeselectedfrom2menand5womentoserveonacom
Fivepairsofsocksareofdifferentcolor.Iftwosocksaretobeselectedatr
Sixdifferentnumbersaretobeselectedfromthe(0,1,2,3,4,5,6)tocompos
随机试题
WhenItrytounderstand______thatpreventssomanyAmericansfrombeingsohapp
Accordingtothepassage,goodteachershould______intheUnitedStates.[br]
Tobesuccessfulinajobinterview,oneshoulddemonstratecertainpersonal
Thedemandforairplanemechanicsisexpectedtogrowabouttenpercentayeari
2017年7月。A煤矿某掘进队负责施工北二采区东一段六层带式输送机上山。25日零
女性,40岁,持续高热伴上腹痛4天,巩膜黄染3天入院。体检:高热面容、神志清、血
2012年第三季度全国100个城市的公共就业服务机构市场中,用人单位通过公共就业
人在每一瞬间,将心理活动选择了某些对象而忽略了另一些对象。这一特点指的是注意的(
每一个生产者都只是被动地接受市场价格,他们对市场价格没有任何控制力量的市场称为(
期货公司接受客户全权委托进行期货交易的,对交易产生的损失承担主要赔偿责任,赔偿额
最新回复
(
0
)