Gwd-19-Q10:谢谢

Gwd-19-Q10:

If $1,000 will be deposited in a bank account and I is the dollar amount of interest earned from the original deposit, represented as I = 1000 {(1 + r/100)ⁿ – 1}, and the annual interest rate is r percent, is r > 8 percent?

(1) The deposit earns a total of $210 in interest in the first 2 years.

(2) (1 + r/100)²> 1.15

答案为D，我选A。由（1）可得 r=10,由（2）可得r>7.3 。

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recently发表于 2006-7-30 16:46 | 只看该作者

我觉得也应该选A，等一下看高手怎么说。

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sunjueliang发表于 2006-8-1 07:02 | 只看该作者

有一道题实在没找到，恳请解答

Gwd-19-Q22:

A researcher plans to identify each participant in a certain medical experiment with a code consisting of either a single letter or a pair of distinct letters written in alphabetical order. What is the least number of letters that can be used if there are 12 participants, and each participant is to receive a different code?

A. 4

B. 5---答案

C. 6

D. 7

E. 8

我选的是A。我觉得关键在于对in alphabetical order的理解，恳请大家帮忙，谢谢

in alphabetical order的意思是按字母顺序吗？也就是ab和ba不一样的意思吧．这样的话４个就够了／关键还是不太确定in alphabetical order