标题: GMAT Prep(08) 输血一题求解 [打印本页] 作者: gmat2000 时间: 2011-3-21 03:09 标题: GMAT Prep(08) 输血一题求解 For all positive integers m, m = 3m when m is odd and m = 1/2 m when m is even. Which of the following is equivalent to 9 x 6 ?
(A) 81 (B) 54 (C) 36 (D) 27 (E) 18
why answer is D, should it be 81??作者: 田田叶子 时间: 2011-3-21 03:19
9 is odd and 6 is even
9 x 6 =(3x9) x (6/2)=81作者: sdcar2010 时间: 2011-3-21 04:09
No. Because the answer D's 27 is in a box, therefore, its true value is 81, the correct answer.作者: gmat2000 时间: 2011-3-21 05:30
Oh, i see. It's in a box. 3Q!作者: gmat2000 时间: 2011-3-21 05:31
出题老头狡猾狡猾地。作者: gmat2000 时间: 2011-3-21 05:54
deleted作者: 昨夜风 时间: 2011-3-21 10:22
in a box 是神马意思啊？作者: yangshao117 时间: 2011-3-21 10:47
这题完全没看懂 求教作者: mijianture 时间: 2011-3-21 10:53
deleted
-- by 会员 gmat2000 (2011/3/21 5:54:38)
同问，什么是 “ in a box”? 谢谢作者: gmat2000 时间: 2011-3-21 12:15
box can't be print here. see PS1-113.作者: gmat2000 时间: 2011-3-21 12:17
Tanya prepared 4 different letters to be sent to 4 different addresses. For each letter, she prepared an envelope with its correct address. If the 4 letters are to be put into the 4 envelopes at random, what is the probability that only 1 letter will be put into the envelope with its correct address?
概率很难。作者: nightingale 时间: 2011-3-21 20:22
1/3作者: sdcar2010 时间: 2011-3-21 23:49
This is akin to do the following: 1) put one letter into its corresponding evelope. 2) put the othe three letters into evelopes. Total possibilites are 6: 1 2 3 A B C A C B B A C B C A C A B C B A 3) caculate what is the probability that all the othe three letters are in wrong evelopes. Only C A B; B C A fulfil this requirement assuming A, B, C matches with 1, 2,3, respectively.
2/6 = 1/3作者: sissi8466 时间: 2011-3-21 23:50
这道数学题的“in the box” 什么意思啊， 在哪看啊作者: helenlife 时间: 2011-3-22 01:41 作者: gmat2000 时间: 2011-3-22 08:31
see Floor10 on pg1作者: gmat2000 时间: 2011-3-22 13:11
Before being simplified, the instructions for computing income tax in Country R were to add 2 percent of one's annual income to the average (arithmetic mean) of 100 units of Country R's currency and 1 percent of one's annual income. Which of the following represents the simplified formula for computing the income tax, in Country R's currency, for a person in that country whose annual income is I ?
why 50+I/40?作者: gmat2000 时间: 2011-3-22 13:29
List K consists of 12 consecutive integers. If -4 is the least integer in list K, what is the range of the positive integers in list K ?