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GMAT PREP - Geometry DS

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Master | Next Rank: 500 Posts
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by kajcha » Sat Sep 01, 2007 1:30 pm
Not sure how to solve this one. Please explain asnwers
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Source: — Data Sufficiency |
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by Bharat » Sat Sep 01, 2007 5:23 pm
Answer must be D (each is sufficient alone)

Use the following two properties of triangles:
A. the sum of three angles = 180 degrees
B. measure of external angle = sum of the other two angle

1. Angle PRS = Angle PQR + Angle QPR (using B above)
Angle PRS - Angle PQR = Angle QPR
Hence SUFFICIENT
2. using the rule A, solve for angle QPR & get the answer.
Hence SUFFICIENT
let me know if there is any error or doubt.
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by kajcha » Sat Sep 01, 2007 6:05 pm
That's correct.. thanks for brushing up my basics :wink:
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