Equation question

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Equation question

by JeetGulia » Fri Sep 10, 2010 3:31 am
If D>0 and 0<1-C/D<1. Which of the following must be true?

I) C>0
II) C/D<1
III) C^2+D^2>1

a) I only
b) II Only
c) I and II only
d) II and III only
e) I, II and III only

Source: Official old gmat papers

OA C
Source: — Problem Solving |

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by Rahul@gurome » Fri Sep 10, 2010 4:25 am
D > 0 and 0 < 1- C/D < 1 implies -1 < -C/D < 0 or 1 > C/D > 0
Since C/D > 0 so C > 0 is true. So, I holds true.
Also, 1 > C/D or C/D < 1, so II holds true.
About III option we cannot say anything.

Therefore, the correct answer is [spoiler](C)[/spoiler].
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