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GMAT PREP - Geometry

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Source: — Data Sufficiency |
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by gmataug08 » Fri Nov 28, 2008 7:21 pm
angle BDC = angle BCD = 2X implies that, BD = BC ;

angle ADB = 180 - 2x (supplementary angles)

that implies DAB + DBA = 2x => DBA = x

that makes AD = BD = 6 => BC = 6

hence stmt 1 is SUFF.
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