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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
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.
Answer: E
答案是D但我选了E
n并没有被定义为年数所以（1）的条件并不能求出r
把r=8 带入（2）(1 + 8/100)2 =1.1668> 1.15 并不能判断出r> 8
求解释
Q17:
A certain right circular cylinder has a radius of 5 inches.There is a kind of liquid filled in this cylinder to the height of 9 inches.If this liquid is poured completely into a second right cylinder, then the liquid will fill the second cylinder to the height of 4 inches.What is the radius of the second cylinder, in inches?
A.6
B.6.5
C.7
D.7.5
E.8
Answer: D
这题怎么做我蒙的。。。
Q26:
How many different 6-letter sequences are there that consist of 1 A, 2 B’s, and 3 C’s ?
A.6
B.60
C.120
D.360
E.720
Answer: C
答案是B 求解释
Q28:
If n is a positive integer, what is the remainder when (74n + 3)(6n) is divided by 10 ?
A.1
B.2
C.4
D.6
E.8
Answer: B
除了代入法还有什么好的方法吗？
多谢
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发表于 2010-10-26 17:54:13
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