首页
登录
职称英语
In a list of numbers, the first number is 3, the second is 4, and each subsequen
In a list of numbers, the first number is 3, the second is 4, and each subsequen
游客
2024-01-12
51
管理
问题
In a list of numbers, the first number is 3, the second is 4, and each subsequent number is the sum of all the preceding numbers in the list. If the 20th number in the list is x, what is the 25th number in the list?
选项
A、7x
B、16x
C、32x
D、35x
E、161x
答案
C
解析
在一个数列中,首项为3,第二项为4,并且下一项是前面所有项的和。若该数列中第20项是x,问第25项是多少?
解:本题的正确答案为(C)。第20项为x,则前19项的和也是x,第21项为2x,22项为4x,由此可推出第25项是32x。
转载请注明原文地址:http://tihaiku.com/zcyy/3356657.html
相关试题推荐
TheAmericanandtheBritish______alargenumberofsocialcustoms.A、joinB、tak
Doyouthinktheyhave______foodforallthesepeoplehere?A、subsequentB、bene
Duringthelastthreedecadesthenumberofpeopleparticipatinginphysicalfit
Thenumberofprimaryschoolsintheruralareas______doublinginthepast50ye
Normallyastudentmustattendanumberofcoursesinordertograduate,and
Normallyastudentmustattendanumberofcoursesinordertograduate,and
Normallyastudentmustattendanumberofcoursesinordertograduate,and
Thenumberoftheemployeesinourcompanyis________thatintheirs.A、twiceasl
Staffhavebeenholdinganumberof________toraisemoneyforcharity.A、eventsB
Iffandgaredistinctprimenumberslessthan10,whichofthefollowingcanno
随机试题
IhaveavegetablegardenandeverysummerIenjoyeatingmyownvegetables.
[originaltext]Areyoufortyyearsoldandfat?Doyouwearfineclothes?Do
Labelthemapbelow.WritethecorrectletterA-H,nexttoQuestions11-15.[img
Peopletendtostrugglewhenlearninganotherlanguage,especiallyiftheya
肌肉组织是由特殊分化的()所组成的。A.肌细胞 B.横纹肌 C.肌原纤维
髋关节前脱位复位最常用的方法是:A.Allis法 B.Hippocrate
关于开放式基金的申购赎回,投资者甲认为,开放式基金的申购赎回只能通过基金管理人的
可乐定降压作用的特点是A:肾血流量减少 B:对消化道溃疡患者不利 C:激动中
从所给四个选项中,选出最合适的一个填入问号处,使之呈现一定的规律性?: A.如
最新回复
(
0
)