Is n an integer?

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RoadtoIVY: Senior | Next Rank: 100 Posts; Posts: 37; Joined: Tue Nov 10, 2009 9:29 pm; Thanked: 1 times

by RoadtoIVY » Sat Nov 21, 2009 4:43 pm

Is n an integer?

1. 2n is an integer
2. 3n is an integer

The source I am referring says D (either) but I feel C is the answer. Please help.

Thanks

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Source: Beat The GMAT — Data Sufficiency | Sat Nov 21, 2009 4:43 pm

brick2009: Master | Next Rank: 500 Posts; Posts: 171; Joined: Mon Jun 01, 2009 8:59 pm; Thanked: 8 times

by brick2009 » Sat Nov 21, 2009 8:51 pm

I agree with you ... answer is C

a.) 2n = Integer

2*1/2 = 1 (integer) ==> n not an integer

2* 2 = 4 (integer) ===> n is an integer

--insuff

b.) Same as above --insuff

together...is 2n and 3n is an integer.. -==> only if n is an integer..

Hence C

any other proof>???

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