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标题: 求解两道题！谢谢 [打印本页]

作者: wechinas 时间: 2008-12-30 07:45 标题: 求解两道题！谢谢

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) 2 is not a factor of n.

(2) 3 is not a factor of n.

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 statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

不太熟悉这种表达方式。 t₁, t₂, t₃, …, t_n, …, t_n+1 = t_n / 2这是什么意思呢？

In the sequence of nonzero numbers t₁, t₂, t₃, …, t_n, …, t_n+1 = t_n / 2 for all positive integers n. What is the value of t₅?

(1) t₃ = 1/4

(2) t₁- t₅ = 15/16

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 statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

作者: yumeeiko 时间: 2008-12-30 19:52

第一题不知道怎么解只知道综合1和2得出 R是偶数并是三的倍数那么就有3个解 6 12 18 然后排出法但是算不清楚请高人指点

第二题是D 吧等比数列 t_n+1 = t_n / 2

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