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number properties

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number properties

by resilient » Wed Mar 05, 2008 10:34 pm
u and v are positive real numbers, is u > v?

1. u^3/v <1

2.(u^1/3)/v < 1

tested numbers and got very messy.

qa is c
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by xilef » Thu Mar 06, 2008 2:03 pm
I

u^3<v - depends if u and v are greater than 1 or between 0 and 1 - INSUFF

II

u < v^3 - numerous possibilities, u=2 and v=3 or u=3 and v=2 and so on, INSUFF


I and II

well, if both are greater than 1 then we know that u has to be less than v in order to satisfy condition I. If both are bet. 0 and 1 then u < v to satisfy condition II. Either way, u<v , answer C.
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REAL NUMBERS

by resilient » Thu Mar 06, 2008 4:14 pm
the constraints are that postive real numbers. so what now?
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by xilef » Thu Mar 06, 2008 5:21 pm
my solution takes that constraint into consideration.
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by aj5105 » Fri May 08, 2009 2:33 am
(C)
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