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If a rational number r satisfies 0 < r < 1, which one is the minimum among the following choices?

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by Max@Math Revolution » Thu Aug 06, 2020 2:38 am

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[GMAT math practice question]

If a rational number r satisfies 0 < r < 1, which one is the minimum among the following choices?

A. r
B. -r
C. -1/r
D. -r^2
E. -1/r^2
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Re: If a rational number r satisfies 0 < r < 1, which one is the minimum among the following choices?

by gmatter923 » Thu Aug 06, 2020 11:15 am
Max@Math Revolution wrote: ↑
Thu Aug 06, 2020 2:38 am
 [GMAT math practice question]

If a rational number r satisfies 0 < r < 1, which one is the minimum among the following choices?

A. r
B. -r
C. -1/r
D. -r^2
E. -1/r^2
IS IT E?
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Re: If a rational number r satisfies 0 < r < 1, which one is the minimum among the following choices?

by Max@Math Revolution » Sun Aug 09, 2020 11:03 pm
=>
We can substitute in a number satisfying the condition.
Assume r = 1/2.
Then -r = -1/2, -1/r = -2, -r^2 = -1/4 and -1/r^2 = -4
Thus -1/r^2 = -4 is the minimum number.

Therefore, E is the correct answer.

Answer: E
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