Stuck on thie

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mbokhari: Newbie | Next Rank: 10 Posts; Posts: 4; Joined: Tue Feb 23, 2010 11:39 am

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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Source: Beat The GMAT — Quantitative Reasoning | Mon Jul 26, 2010 11:22 am

outreach: Legendary Member; Posts: 748; Joined: Sun Jan 31, 2010 7:54 amFollowed by: 3 members; Thanked: 46 times

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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https://amarnaik.wordpress.com
MBA blog
https://amarrnaik.blocked/

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mbokhari: Newbie | Next Rank: 10 Posts; Posts: 4; Joined: Tue Feb 23, 2010 11:39 am

by mbokhari » Tue Jul 27, 2010 6:34 am

Oh I see!! I missed the last step. Thnx a ton

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Operation780: Junior | Next Rank: 30 Posts; Posts: 10; Joined: Mon Jun 21, 2010 8:03 am

by Operation780 » Thu Jul 29, 2010 1:15 am

i am unable to follow it... can someone elaborate it pls.

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kvcpk: Legendary Member; Posts: 1893; Joined: Sun May 30, 2010 11:48 pmFollowed by: 7 members; Thanked: 215 times

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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bdevas01: Senior | Next Rank: 100 Posts; Posts: 36; Joined: Thu Dec 31, 2009 5:54 am; Location: New York City; Thanked: 2 times

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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selango: Legendary Member; Posts: 1460; Joined: Tue Dec 29, 2009 1:28 amFollowed by: 7 members; Thanked: 135 times

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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