作者zoo22 (zoo)
看板GRE_Verbal
標題[計量] Strange JJ
時間Mon Oct 22 23:39:05 2007
9. Roger sold a watch at a profit of 10%. If he had bought it at
10% less and sold it for $13 less he would have made a profit of 15%.
What is the cost price of the watch?
A) $220
B) $300
C) $400
D) $480
E) $540
Ans: A
7. If from jan 1 1990 to jan 1 1995 i.e. in 5 yrs the population increased by
15% and from jan1 1990 to jan 1 2000 i.e. in the period of 10yrs the population
increased by 30%
col a: the population increase from jan 1 1995 to jan 1 2000
colb :15%
How many combinations of three numbers from 1 to 10 can be made such that x<y<z.
where x,y,z belongs to 1 to 10
ex: (1,2,3) ; (2,4,10)
Ans: 512
Probability that it will rain on monday and not on tuesday is 0.4
Probability that it will rain on tuesday and not on monday is 0.2.
Cola: Probability that it will not rain on both the days
Colb: 0.35
Ans: A???
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◆ From: 59.105.92.241
1F：推 sawang:最後一題畫Venn diagram沒有intersection囧 61.229.203.132 10/23 00:49
2F：→ sawang:這樣可以算嗎? 61.229.203.132 10/23 00:49
3F：推 bmonkey71:最後一題我也覺得沒辦法比較 61.64.95.112 10/23 02:50
4F：→ bmonkey71:最後第二題我認為是C10取3 61.64.95.112 10/23 02:51
5F：推 aboa:倒數第二題要考慮大小順序，不可能是C10取3 61.230.205.220 10/23 13:51
6F：→ aboa:而且怎麼想都覺得512這個答案好像太大了 61.230.205.220 10/23 13:52
7F：推 bmonkey71:就是因為考慮了大小排列的關係所以是, 61.64.95.112 10/23 15:12
8F：→ bmonkey71:C10取三 不需要特別排列 因為每三個照大 61.64.95.112 10/23 15:14
9F：→ bmonkey71:小排列只有一種~ 我的想法是這樣子，討 61.64.95.112 10/23 15:14
10F：→ bmonkey71:論看看吧!! 61.64.95.112 10/23 15:15
11F：推 ykshih:C10取3 +1 140.112.18.199 10/23 15:48