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2) DS a/b terminating decimal?

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Source: — Data Sufficiency |
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by beat_gmat_09 » Fri Apr 30, 2010 9:59 pm
ern5231 wrote:2) a, b are positive integers. Does a / b have a terminating decimal?
1> a = 5 ^ r, r is some positive integer
2> b = 2 ^ s, s is some positive integer
IMO D

A - alone is not sufficient because denominator is not known.
B - not suff because numerator is not known.

combine A & B take r and s as any +ve numbers the result will always terminate.
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by liferocks » Fri Apr 30, 2010 10:15 pm
My take is ans B

fraction with the lowest denominator of 2 or 5 or their power will always terminate as they are factors of 10

option 2 says the the denominator is 2^s hence sufficient but option 1 does not say anything about the denominator.Hence not sufficient
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by ern5231 » Sun May 02, 2010 1:22 pm
OA is B
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