请教几道数学题

yingyzhang

一道是prep的

If k is an integer greater than 1, is k equal to 2^r for som positive integer r?

1. k is divisible by 2^6

2. k is not divisible by any odd integer greater thatn 1

answer: B

If t is a positive integer and r is the remainder when t^2+5t+6 is divided by 7, what is the value of r?

1. when t is divided by 7, the remainder is 6

2. when t^2 is divided by 7, the remainder is 1

Answer: A

还有一到是pp3-gmat里面的

Pat will walk from intersection X to intersection Y along a route that is confined to the square grid of four streets and the three avenues shown in the map above. How many routes from X to Y can Pat take that have the minimum possible length?

A. six

B eight

c.ten

D. fourteen

E sixteen

Answer: C

(图案等一下啊)

yingyzhang

画得不是很好啊，不过应该可以看出来

[attachimg]61677[/attachimg]

不知道为什么显示出来有点问题呢,反正图案就是井字型的,四行三列,X 在(1,A) Y在 (4,C)

[此贴子已经被作者于2007-10-31 7:40:05编辑过]