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naveenhv: Senior | Next Rank: 100 Posts; Posts: 41; Joined: Wed Dec 16, 2009 8:26 am; Thanked: 1 times

by naveenhv » Mon Apr 25, 2011 8:23 am

For how many integers n is 2^n = n^2 ?

a. None
b. One
c. Two
d. Three
e. More than three

Source: Beat The GMAT — Quantitative Reasoning | Mon Apr 25, 2011 8:23 am

vineeshp: Legendary Member; Posts: 965; Joined: Thu Jan 28, 2010 12:52 am; Thanked: 156 times; Followed by:34 members; GMAT Score:720

by vineeshp » Mon Apr 25, 2011 6:29 pm

OA C.

For 2,4 the equality holds.
For no other power of 2, the equality holds.

(non-powers of 2 cannot be considered, 2^n has to be a power of 2.)

Vineesh,
Just telling you what I know and think. I am not the expert.

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