Tough math problems + permutations/combinations

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ssang
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Topic: Tough math problems + permutations/combinations
PostTue Apr 01, 2008 1:55 am
I'm posting tough math problems that I've received from Kirtanasarin on Test Magic
http://www.urch.com/forums/just-finished-my-gmat/87585-500-640-q45-v34-notes.html

I've basically reclassified and split them up to 2 different word doc. Also added a few of my own problems.

Note there are two documents here:
1. gmat more difficult questions
2. permutations & combinations
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richardwang6430
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PostSat Apr 19, 2008 3:59 am
Do you have answer with explanation?
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gabriel
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PostSat Apr 19, 2008 4:05 am
ssang, thank you for sharing this. But are you sure there is no copyright issues with these questions.
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gabriel
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PostSat Apr 19, 2008 4:13 am
richardwang6430 wrote:
Do you have answer with explanation?
Hey richard, just post the questions you have trouble with on the forum. I am sure you will get the required explanations and answers
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mbadreams
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PostSat Sep 26, 2009 10:39 am
1. 2n is an integer
2. 3n is an integer

Data sufficiency qstn in the attached document. Answer given is D. Can some one explain how?

This is my answer.

1. Insufficient.

if n = 1/2 2n is integer. but n is not integer
if n= 2 , 2n is integer and n is integer.

2. Insufficient

if n = 1/3 3n is integer. but n is not integer
if n= 3 , 3n is integer and n is integer.

Both together if 2n is integer and 3n is integer,
then n is inetger . Sufficient.
IMO C[/spoiler]
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