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1. If n is a positive integer and r is the remainder when (n - 1)(n + 1) is divided by 24, what is the value of r ?
(1) n is not divisible by 2. (2) n is not divisible by 3.
(2) n is not divisible by 3.
2. Each employee of Company Z is an employee of either Division X or Division Y, but not both. If each division has some part-time employees, is the ratio of the number of full-time employees to the number of part-time employees greater for Division X than for Company Z. (1) The ratio of the number of full-time employees to the number of part-time employees is less for Division Y than for Company Z. (2) More than half of the full-time employees of Company Z are employees of Division X, and more than half of the part-time employees of Company Z are employees of Division Y.
(2) More than half of the full-time employees of Company Z are employees of Division X, and more than half of the part-time employees of Company Z are employees of Division Y.
3. Six countries in a certain region sent a total of 75 representatives to an international congress, and no two countries sent the same number of representatives. Of the six countries, if Country A sent the second greatest number of representatives, did Country A send at least 10 representatives?
(1) One of the six countries sent 41 representatives to the congress.
(1) One of the six countries sent 41 representatives to the congress.
(2) Country A sent fewer than 12 representatives to the congress. 4. When a certain tree was first planted, it was 4 feet tall, and the height of the tree increased by a constant amount each year for the next 6 years. At the end of the 6th year, the tree was 1/5 taller than it was at the end of the 4th year. By how many feet did the height of the tree increase each year?
基本都错在DS上~求教各位解题思路~怎么老在DS上栽倒？
对于回答特殊疑问句的（比如what is the value?之类的）是不是要求唯一解，才算充分？ 对于回答一般疑问句的（Is A>B?）是不是要能回答Yes，才算充分？ 我的理解没有问题吧？
基本都错在DS上~求教各位解题思路~怎么老在DS上栽倒？
对于回答特殊疑问句的（比如what is the value?之类的）是不是要求唯一解，才算充分？ 对于回答一般疑问句的（Is A>B?）是不是要能回答Yes，才算充分？ 我的理解没有问题吧？
[此贴子已经被作者于2007-11-15 17:14:42编辑过] | 
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发表于 2007-11-15 17:05:00
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