BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

2) DS a/b terminating decimal?

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Data Sufficiency |
Master | Next Rank: 500 Posts
Posts: 437
Joined: Sat Nov 22, 2008 5:06 am
Location: India
Thanked: 50 times
Followed by:1 members
GMAT Score:580

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.
Top
Legendary Member
Posts: 576
Joined: Sat Mar 13, 2010 8:31 pm
Thanked: 97 times
Followed by:1 members

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
"If you don't know where you are going, any road will get you there."
Lewis Carroll
Top
Master | Next Rank: 500 Posts
Posts: 226
Joined: Sun Aug 09, 2009 4:34 am

by ern5231 » Sun May 02, 2010 1:22 pm
OA is B
Top
Post new topic Post Reply
• Page 1 of 1