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Senior Manager
Joined: 12 Mar 2006
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Schools: Kellogg School of Management
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Is 5^k less than 1,000 ? (1) 5^(k-1) > 3000 (2) 5^(k-1) = [#permalink]
 28 Feb 2007, 22:49
Question Stats:
0% (00:00) correct
 0% (00:00) wrong based on 0 sessions
Is 5^k less than 1,000 ?
(1) 5^(k-1) > 3000
(2) 5^(k-1) = 5^k - 500
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Senior Manager
Joined: 29 Jan 2007
Posts: 455
Location: Earth
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I go with D as well.
You can solve both
for 1 I got
5^K > 15000
for 2 I got
5^k = 2500/4
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VP
Joined: 09 Jan 2007
Posts: 1046
Location: New York, NY
Schools: Chicago Booth Class of 2010
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1) 5^(k-1)>3000
5^k>5*3000=15000
Suf
2)5^(k-1)=5^k-500
5^k=5^(k+1)-2500
5^(k+1)-5^k=2500
5^k*5-5^k=5^4*2^2
5^k*(5-1)=5^4*2^2
5^k=5^4
Suf
But one don't need to solve that, by discovering that we could solve the equation, we could know that k, and consequently, 5^k could be solved, so 2 would be suf.
D
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