解析 C [解析] 前n个正整数的和为: S=1+2+3+…+n 前n个正偶数的和为: 2+4+6+…+2n=2(1+2+3+…+n)=2S 结果一 题目 If the sum of the first n positive integers is S,what is the sum of the first n positive even integers, in terms of S ?() A.5/2 B.S C.2S D.2S+2...
[解析] 当S<20时,S的取值范围较大,因此n的取值是不确定的,有好几个,所以(1)不充分;根据(2)同样无法得到确定的n值;根据(1)+(2)可得S的取值范围为[*],虽然S的值是不确定的,但只有当n=5时才满足上面的不等式,也即n的值惟一,所以(1)+(2)能充分地回答上面的问题。结果...
athe sum of the first n positive integers is given by sum(n):if n=0 then return(0) else return (n+sum(n-1)) 总和测量第一个n正面整数的总和(n) :如果n=0然后回归(0)回归(n+sum (n-1))[translate]
回收铝; 玻璃; 塑料,纸,报纸,杂志; 电话簿和皱纸板。 [translate] aThen, use your result to find a formula for the sum of the first n positive integers. 然后,使用您的结果发现一个惯例为第一个n正面整数的总和。 [translate] 英语翻译 日语翻译 韩语翻译 德语翻译 法语翻译 俄语翻译 阿拉伯语翻译 ...
一道Gmat数学题!For any positive integer n,the sum of the first n positive integers equals n(n+1)/2.what is the sum of all the even integers between 99 and 301?
1. for any positive integer n, the sum of the first n positive integers equals [n(n+1)]/2. what is the sum of all the even integers between 99 and 301?A 10,100B 20,200C 22,650D 40,200E 45,150 相关知识点: 试题来源: 解析 选择B解释:对任意整数n 前n项和是[n(n+1)]/2...
Gmat数学翻译 句子中“the first”意思[ For any positive integer n,the sum of the first n positive integers equals n*(n+1)/2.] 相关知识点: 试题来源: 解析 应该是the first to n…….意思是,对任意一个正整数n,从1到正整数n的和等于n*(n+1)/2....
Data Sufficiency_If S is the sum of the first n positive integers, what is the value of n ? S < 20 S 2 > 220
For any positive integer n , the sume of the first n positive integers equal [n/(n+1)]/2.What is the sum of all the even integers between 99and 301? A10100 B 20200 C 22650 D 40200 E 45150 解答: 点赞0 阅读3443 解答: sysadmin老师 ...
ali jun said 锂6月认为[translate] ahandlealert handlealert[translate] anot be necessary. 不是必要的。[translate] aUse your conjecture to find a formula for the sum of the first n positive integers. 使用您的臆想发现一个惯例为第一个n正面整数的总和。[translate]...