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Re: GMAT Prep 1: Symbolism [#permalink]
 13 Feb 2010, 11:25
carriedinterest wrote: For all positive integers m, M=3m when m is odd and M=1/2 when m is even. Which of the following is equivalent to 9 x 6?
A) 81
B) 54
C) 36
D) 27
E) 18
Clear, concise explanations welcome!
It should be D.... Please check... 9 x 6 = (3x9) x (6 x 1/2) = 27 x 3 = 27
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Re: GMAT Prep 1: Symbolism [#permalink]
13 Feb 2010, 11:26
carriedinterest wrote: LJ wrote: You posted this question incorrectly because all of the answers need to be surrounded with a box, or in your notation, an underline. Failing to do this misses the point of the problem. Good spot. I've corrected the answer choices. You're obviously familiar with the problem - care to answer? = 27 and 6 = 3, multiplied together they = 81. Because the answer choices are notated with the _, however, you need to calculate the "_" value of 81 When m is odd, 3m = 81, so m = 27
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GMAT Prep1: positive integer m [#permalink]
20 Feb 2010, 06:09
For all positive integers m, [m] = 3m when odd and [m] = (1/2)m when m is even. Which of the following is equal to [9]*[6]?
a) [81]
b) [54]
c) [36]
d) [27]
e) [18]
Last edited by pm4553 on 20 Feb 2010, 11:13, edited 1 time in total.
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Re: GMAT Prep1: positive integer m [#permalink]
20 Feb 2010, 08:04
[9]*[6]=(3 x 9)*(1/2 x 6) = (27) * (3) = 81
I think in the GMAT Prep question, there are square brackets around the answer also.
Only d, [27] = 3*27 = 81
Hence the answer.
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Re: GMAT Prep1: positive integer m [#permalink]
20 Feb 2010, 11:16
testprep2010 wrote: [9]*[6]=(3 x 9)*(1/2 x 6) = (27) * (3) = 81
I think in the GMAT Prep question, there are square brackets around the answer also.
Only d, [27] = 3*27 = 81
Hence the answer. Edited, thanks. Even I picked A, unfortunately, it isn't correct. I have no clue WHY
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easy question and mysterios answer choice, pls help! [#permalink]
30 Apr 2010, 10:39
It is a question from GMATprep question itself: For all positive integers m, {m}=3m, when m is odd, and {m}=m/2 when m is even. which of the following is equivalent to {9}*{6} ? a){81} b){54} c){36} d){27} e){18} my solution: solution seemed to me very easy 9 is odd and 6 is even so ={9*3}*{6/2}=27*3=81 and it is wrong!  pls help me. p.s. OA I will put later.
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Re: Tough Algebra, Can anyone help me? Thanks!! [#permalink]
30 Apr 2010, 14:31
MSoS wrote: Since the numbers are in boxes, we have to solve the Question twice.
First look at the given numbers (9 is odd so 3m, 6 is even so 1/2m)
[9]x[6] = 3(9)x1/2(6) = 81
Now look at 81 which is obviously odd which means that the answer has to be 3m = 81 (answer is also in a box)
hence, m = [27] Thanks! damn, I have to think twice, before doing such kind of questions.
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Re: GMAT Prep1: positive integer m [#permalink]
17 May 2010, 21:42
i made the same mistake with the boxes .....gmat is really smart with tricking you with such questions .....one thing that i noticed was that i make a lot of mistakes when converting the algebraic expression so lets say they asked about the product ...i will for some reason start adding in my calculation
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Re: GMAT Prep1: positive integer m [#permalink]
22 Jun 2010, 07:21
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What means this: [m] (m in a square) ? [#permalink]
14 Nov 2010, 02:46
Hello,
I have some problems to solve this question:
For all positive integers m, [m] = 3m when m is odd and [m] = 0,5m when m is even. Which of the following is equivalent to [9] x [6] ?
A 81
B 54
C 36
D 27
E 18
_________________________________________________________________________
[m] is a m in a square
What do THEY want from me ??? m in a square, I've no idea what's the meaning of this sign.
Source: GMATPrep
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Re: What means this: [m] (m in a square) ? [#permalink]
14 Nov 2010, 03:18
Pepe wrote: Hello,
I have some problems to solve this question:
For all positive integers m, [m] = 3m when m is odd and [m] = 0,5m when m is even. Which of the following is equivalent to [9] x [6] ?
A 81
B 54
C 36
D 27
E 18
_________________________________________________________________________
[m] is a m in a square
What do THEY want from me ??? m in a square, I've no idea what's the meaning of this sign.
Source: GMATPrep [m] is being defined as a function, its the same thing as saying f(m) is a function such that .... Now we need to find out [9] x [6] [9] --> Since 9 is odd, [9]=3x9=27 [6] --> Since 6 is even, [6] = 0.5x6 = 3 Hence [9]x[6]=27x3=81
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Re: Very easy but still got wrong.. Need Your answer [#permalink]
14 Nov 2010, 10:11
Thank you guys. I'll now focus always also on the answer choices, not only on the questions. Didn't see, that the answers were also in squares. 
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Need help with these 5 GMAT Prep questions... [#permalink]
08 Dec 2010, 14:51
Guys, as my G-day is approaching, I am putting more and more effort in improving my Quant. However, I seem to have troubles with some basic concepts. Below are the 5 questions which I know have simple explanations but are for some reason difficult for me to understand. If you can explain the solutions for any of them, I would greatly appreciate it! Cheers!   Uploaded with ImageShack.us
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massive-collection-of-verbal-questions-sc-rc-and-cr-106195.html#p832142
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Re: Tough Algebra, Can anyone help me? Thanks!! [#permalink]
27 Feb 2011, 00:18
IanStewart wrote: We know that [9] = 3*9 = 27, since [x] = 3x when x is odd. We also know that [6] = 3, since [x] = x/2 when x is even. So [9]*[6] = 27*3 = 81.
Now, many people choose the wrong answer to this question, despite doing all of the work correctly, because they do not notice that the answer choices are all in boxes - a devious GMAT trap. So the answer choice which reads [81] is not equal to the number 81; it is equal to 3*81 = 243, because [x] = 3x when x is odd. The correct answer here is [27], which is equal to the number 81. Thanks mate! This one was my big "AHA! Gotcha" GMAT moment for the day. A clever trap!
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Positive Integer m [#permalink]
29 Apr 2011, 02:03
Attachment: 
Interger m.JPG [ 64.83 KiB | Viewed 253 times ]
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Re: Positive Integer m [#permalink]
29 Apr 2011, 02:55
I picked up 81 too  Guess we have to first multiple 9*6=[54] then apply the rule of 1/2m = 1/2 * 54 = 27. Question is why not 81?
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Re: Positive Integer m [#permalink]
29 Apr 2011, 06:54
You're ignoring the box symbol in the answer. Please try again bearing this in mind.
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Re: Positive Integer m [#permalink]
29 Apr 2011, 06:56
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[9] = 3*9 = 27 [6] = 3 So [9] * [6] = 81 but we need to pick one option among the answer choices with [] So [27] = 3*27 = 81 Answer - D
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Re: Positive Integer m [#permalink]
29 Apr 2011, 07:00
Excellent. Thank you subhashghosh.
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Re: Positive Integer m [#permalink]
29 Apr 2011, 07:52
Box 9 = 3*9 =27 Box 6 = 3 Box 9 * Box 6 = 27 *3 = 81 Calculating boxes in answer we can see that box 27 is the answer. Posted from my mobile device 
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Re: Positive Integer m
[#permalink]
29 Apr 2011, 07:52
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