Tough math problems + permutations/combinations

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ssang: Newbie | Next Rank: 10 Posts; Posts: 3; Joined: Tue Mar 25, 2008 7:57 am; Thanked: 5 times

by ssang » Tue Apr 01, 2008 1:55 am

I'm posting tough math problems that I've received from Kirtanasarin on Test Magic
https://www.urch.com/forums/just-finishe ... 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

Attachments

GMAT Math more difficult qn .doc: Gmat more difficult qn; (239 KiB) Downloaded 840 times

Permutations, Combinations and Probabilities.doc: Permutations, combinations and a little probabilities; (161 KiB) Downloaded 948 times

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Source: Beat The GMAT — Problem Solving | Tue Apr 01, 2008 1:55 am

richardwang6430: Senior | Next Rank: 100 Posts; Posts: 32; Joined: Sat Apr 12, 2008 6:23 pm; Thanked: 1 times

by richardwang6430 » Sat Apr 19, 2008 3:59 am

Do you have answer with explanation?

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gabriel: Legendary Member; Posts: 986; Joined: Wed Dec 20, 2006 11:07 amFollowed by: 1 member; Location: India; Thanked: 51 times

by gabriel » Sat 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: Legendary Member; Posts: 986; Joined: Wed Dec 20, 2006 11:07 amFollowed by: 1 member; Location: India; Thanked: 51 times

by gabriel » Sat 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: Senior | Next Rank: 100 Posts; Posts: 34; Joined: Mon Aug 10, 2009 8:58 am; Thanked: 1 times

Is n an integer?

by mbadreams » Sat 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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