method 1: Find the sum of all the digits of the number: 3+A+A+1=4+2A . To make 4+2A a multiple of 3, A=1, 4, or 7. method 2: 3+A+A+1=4+2A should be divisible by 3. When 2A+4=6, A=1. When 2A+4=12, A=4. When 2A+4=18, A=7. So A is 1, 4, or 7....
把这两个式子代入xy+1可得: xy+1=(3m+1)(9n+8)+1 =27mn+24m+9n+84-1 =3(9mn4-8m+3n+3) 因此xy+1能被3整除,所以(1)+(2)充分。结果一 题目 If a, b, and c are integers, is the number 3 (a+b)-c divisible by 3 ?() (1)a+b is divisible by 3. (2)c is divisib...
M = {1,2,3,4,5,6,7,8},A M,A Ø.If S(A) is divisible by 3 and not divisible by 5,where S(A) is the sum of all elements of A,Find the number of all possible set of A. 相关知识点: 试题来源: 解析 米= { 1,2,3,4,5,6,7,8 },一米,一个Ø.如果第(...
[Data Sufficiency] 试题详情 题目: Is the integernodd? (1)nis divisible by 3. (2) 2nis divisible by twice as many positive integers asn. 选项: 答案: B 提问列表 提问: 请问条件2应该怎么理解 谢谢 解答: 注册太麻烦?点这里查看免费答疑吧!
(1)n is divisible by 3(2)2n is divisible by twice as many as positive integers as n 相关知识点: 试题来源: 解析 (1)不一定,比如6 (2)n一定是奇数.如果n是奇数,那么2n的因子的数量是 n的因子的数量 的2倍.如果是偶数,则不然.证明不写了,给你举个例子 比如n=21 它的因子为 1,3,7,21,...
百度试题 结果1 题目What number between 200 and 300 is exactly divisible by 3, by 5, and by 7?相关知识点: 试题来源: 解析 210.
(1)n is divisible by3.(2)2n is divisible by twice as many positive integers as n. 选项: A、 Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient. B、 Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient. C、 BOTH statement TOGETHER...
If a is an integer divisible by 3, and b is not divisible by 3, which of the following is...
This gives us 105\times 2=210 which is divisible by 3, 5, and 7 and is also between 200 and 300. The number is 210.若一个数能被3,5和7整除,那么它一定能被它们的最小公倍数整除.因为3,5 和7除了1之外没有共同的因子,所以这三个数的最小公倍数是它们的乘积.因为3\times 5\times 7=...
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