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
If z1 z2, z3…zn is a series of consecutive positive integers, is the sum of all these integers odd? (1)(z1+z2+z3+…+zn)/n is an o
If z1 z2, z3…zn is a series of consecutive positive integers, is the sum of all these integers odd? (1)(z1+z2+z3+…+zn)/n is an o
admin
2022-12-09
45
问题
If z
1
z
2
, z
3
…z
n
is a series of consecutive positive integers, is the sum of all these integers odd?
(1)(z
1
+z
2
+z
3
+…+z
n
)/n is an odd integer.
(2)n is odd.
选项
A、Statement (1) ALONE is sufficient, but statement (22) alone is not sufficient to answer the question asked.
B、Statement (2) ALONE is sufficient, but statement (21) alone is not sufficient to answer the question asked.
C、BOTH statement (1) and (22) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient.
D、EACH statement ALONE is sufficient to answer the question asked.
E、Statement (1) and(22)TOGETHER are NOT sufficient to answer the question asked, and additional data specific to the problem are needed.
答案
A
解析
Statement (1),z
1
+z
2
+z
3
+…+z
n
=z
1
+(z
1
+1)+(z
1
+2)+…+(z
1
+n-1)=nz
1
+n(n-1)/2,那么(z
1
+z
2
+z
3
+…+z
n
)/n=z
1
+(n-1)/2,现在这个数为奇数,那么n一定为奇数,z
1
+z
2
+z
3
+…+z
n
=(z
1
+z
2
+z
3
+…+z
n
)/n×n=奇数×奇数=奇数,所以单独(1)能够回答问题。Statement (2)仅仅告诉n是奇数,无法确定它们的和是偶数还是奇数,所以A为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/aLqD777K
本试题收录于:
GMAT QUANTITATIVE题库GMAT分类
0
GMAT QUANTITATIVE
GMAT
相关试题推荐
HowtoBuildYourVocabularyEffectivelyVocabularyisthefoundationoflearningalanguage.Withoutit,noneoftheskill
PassageOne(1)Atacertainseasonofourlifeweareaccustomedtoconsidereveryspotasthepossiblesiteofahouse.Ihav
PASSAGETWOAccordingtotheauthor,whatmaymotivatepeopletobuyhousesduringthecoronaviruspandemic?
HowtoBondwithYourBossHavingagoodrelationshipwithyourbosshasapositiveimpactonyourcareer.Accordingtorese
PASSAGETWO(1)Thesaltequationtaughttodoctorsformorethan200yearsisnothardtounderstand.Thebodyreliesonthise
A.amuseB.astonishmentC.deeplyD.discoveryE.earnestF.employedG.lyingH.pursueI.removedJ.
Whichofthefollowingsentencesexpresses"probability"?
Youcannotimaginehow________Ifeelwithmydutiessometimes.
It’snotliquid,gasorsolid.It’snotananimal,aplantoramineral.It’stransparent(透明的),butcanbeseenfromadistance
我国政府历来非常重视汽车工业的发展。自1949年中华人民共和国成立以来,为了将汽车工业发展成为民族工业,政府对其给予高度保护。然而,在诸多汽车企业中,上规模的并不多。20世纪80年代中期以来,在投资优惠政策(preferentialpolicy)的鼓励下
随机试题
班组长的岗位职责有哪些?
胆汁中的主要固体成分是
男性,36岁,发现无痛性的锁骨上淋巴结肿大2个月,且伴发热、盗汗,近几个月来自感体重减轻明显,偶尔出现皮肤瘙痒,肝脾不大。为进一步诊治有必要做下列哪项检查
下列不属于施工成本控制的依据的是()。
从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律性:
中国与西域文明经过陆上丝绸之路进行交流碰撞。下列诗句中,与中国—西域文明交流无关的是:
法律形式又称()。
在对高级语言源程序进行编译的过程中,为源程序中变量所分配的存储单元的地址属于(22)。
Ourteacheralwaysmakesus______hard.
WhyMinorityStudentsDon’tGraduatefromCollege[A]BarryMills,thepresidentofBowdoinCollege,wasjustifiablyproudofBow
最新回复
(
0
)