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Stuck on thie

Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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by mbokhari » Mon Jul 26, 2010 11:22 am
Hi all
Need help with the following.
For all positive integers m, m is M= 3m when m is odd and M=1/2m when m is even. What is the value of 9 * 6?

The answer is 27 but I have no clue of how.

Thnx in advance
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by outreach » Mon Jul 26, 2010 9:44 pm
9 =27
6=3

9 * 6=81
81 is odd and is of the form 3*27
hence 27 is the ans
mbokhari wrote:Hi all
Need help with the following.
For all positive integers m, m is M= 3m when m is odd and M=1/2m when m is even. What is the value of 9 * 6?

The answer is 27 but I have no clue of how.

Thnx in advance
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by mbokhari » Tue Jul 27, 2010 6:34 am
Oh I see!! I missed the last step. Thnx a ton
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by Operation780 » Thu Jul 29, 2010 1:15 am
i am unable to follow it... can someone elaborate it pls.
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by kvcpk » Thu Jul 29, 2010 2:24 am
mbokhari wrote:Hi all
Need help with the following.
For all positive integers m, m is M= 3m when m is odd and M=1/2m when m is even. What is the value of 9 * 6?

The answer is 27 but I have no clue of how.

Thnx in advance
I think the question is incomplete. What is the source?
it is not given that 9 * 6 will give some value in "BAR"

If the question just asks for 9 * 6, answer should be 81 only.
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by bdevas01 » Thu Jul 29, 2010 8:52 am
There is an issue with the question. It can only be 27 if the question specifically stated M = 81, and asked what m was and clearly stated that m is an odd number! If its not stated that m has to be an odd number, then m could be 27 or 162.

If anyone doesnt understand why this has to be the case, let me know.
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by selango » Fri Jul 30, 2010 9:51 pm
This is the question from GMATPREP.

The question is For all positive integers m, m is [M]= 3m when m is odd and [M]=1/2m when m is even. What is the value of [9] *[ 6]?

[9]*[6]=81.This is right

But the answer options are in the format [M].

81=[27]

So the answer is [27].

mbokhari,

Always pls post the question correctly..
--Anand--
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