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PS - Exponent

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Xbond: Master | Next Rank: 500 Posts; Posts: 275; Joined: Wed Jul 02, 2008 4:19 am; Thanked: 4 times

by Xbond » Sat Aug 22, 2009 9:44 am

Hi there,

Could you explain the concept of this DS in simplest way

For how many integers n is 2expo(n) = nexpo(2) ?
a)None
b)One
c)Two
d)Three
e)More than three

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Source: Beat The GMAT — Problem Solving | Sat Aug 22, 2009 9:44 am

arbiter: Senior | Next Rank: 100 Posts; Posts: 36; Joined: Mon Jun 09, 2008 9:17 am; Thanked: 2 times

Re: PS - Exponent

by arbiter » Sat Aug 22, 2009 11:54 am

Xbond wrote:Hi there,

Could you explain the concept of this DS in simplest way

For how many integers n is 2expo(n) = nexpo(2) ?
a)None
b)One
c)Two
d)Three
e)More than three

is it C ?

arbiter

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Xbond: Master | Next Rank: 500 Posts; Posts: 275; Joined: Wed Jul 02, 2008 4:19 am; Thanked: 4 times

by Xbond » Sun Aug 23, 2009 2:32 am

sorry, but you don't explain anything

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real2008: Legendary Member; Posts: 527; Joined: Thu May 01, 2008 12:06 am; Thanked: 7 times

by real2008 » Mon Aug 24, 2009 10:57 am

i think it is B

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shanrizvi: Senior | Next Rank: 100 Posts; Posts: 73; Joined: Tue Aug 11, 2009 2:30 am; Thanked: 2 times; GMAT Score:720

by shanrizvi » Tue Aug 25, 2009 12:08 pm

n 2^n n^2 COUNT
2 4 4 +1
4 16 16 +1

I don't think there are any other solutions. I'd go for C.

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