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GMAT Prep - 2 Ques

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Manpreet Singh: Newbie | Next Rank: 10 Posts; Posts: 7; Joined: Tue Apr 12, 2011 6:48 am

by Manpreet Singh » Mon May 13, 2013 6:14 am

Is the integer n odd?
(1) n is divisible by 3
(2) 2n is divisible by twice as many positive integers as n

Mitch, please explain the statement 2..

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Source: Beat The GMAT — I just Beat The GMAT! | Mon May 13, 2013 6:14 am

Menzorra: Junior | Next Rank: 30 Posts; Posts: 10; Joined: Wed Mar 06, 2013 8:18 am

by Menzorra » Mon May 13, 2013 6:32 am

What I think:

The value for 2N contains twice as many ways you can divide that number than just N.
Let say N = 3 (divisible by 1 and 3)
2N=6 (divisible by 1, 3 and 2)

In this case 2N can only be divided 1 time more than just N. So in statement two N = more than 3 You should find the number that fits.

Hope this is a bit more clear, its hard to explain

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freyesinsb: Junior | Next Rank: 30 Posts; Posts: 16; Joined: Thu Aug 25, 2011 2:13 pm

by freyesinsb » Mon May 13, 2013 7:33 am

1. Insufficient-N could be 3 or 6 and would satisfy the question.
2. Try picking numbers-1 would satisfy as 1 only has one factor. Multiply by two and the factors double. 3 would satisy (two factors 3 and 1). Multiply by two to get six and the factors double (1,3,2,6). Since two conditions are met, this is also insufficient.

Combine the statements and you should get C as the answer. I tried picking more numbers to see if any more met the condition but couldn't find any.

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Manpreet Singh: Newbie | Next Rank: 10 Posts; Posts: 7; Joined: Tue Apr 12, 2011 6:48 am

by Manpreet Singh » Mon May 13, 2013 10:22 am

Freyesinsb OA is B

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Manpreet Singh: Newbie | Next Rank: 10 Posts; Posts: 7; Joined: Tue Apr 12, 2011 6:48 am

by Manpreet Singh » Mon May 13, 2013 10:24 am

Menzorra : I am still unable to understand. Can you please explain in little depth

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freyesinsb: Junior | Next Rank: 30 Posts; Posts: 16; Joined: Thu Aug 25, 2011 2:13 pm

by freyesinsb » Mon May 13, 2013 2:12 pm

Most GMAT Prep questions have been done on here before. Try searching on google or on the site for thread. Here is the solution. Hope it helps.

https://www.beatthegmat.com/is-the-integ ... 81868.html

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