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Source: — Data Sufficiency |
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by mayur00 » Tue Sep 09, 2008 12:34 pm
1) 5^(k+1)>3000

=> 5^k>600 (dividing both sides by 5)

This is insufficient since 5^k can be anything greater than 600.

2) 5^(k-1) = 5^k - 500

Therefore 5^k-5^(k-1) = 500
or 5^k ( 1 - 1/5) = 500
or 5^k = 500 * 5 / 4 = 625 which is <1000

Therefore statement 2 is sufficient. Hence answer B
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