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# fractions

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Senior Manager
Joined: 19 Nov 2007
Posts: 433

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10 Jun 2009, 16:11
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 100% (01:29) wrong based on 1 sessions

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If the fraction $$m/n$$ is negative, which of the following cannot be true?

1]$$n/m > m/n$$
2] mn 0
4] $$mn^3$$ > 0
5] m-n > 0

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Current Student
Joined: 03 Aug 2006
Posts: 112
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Schools: Haas School of Business

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10 Jun 2009, 16:35
The answer is (4).

Given
$$\frac{m}{n}<0$$

i.e. if m is +ve then n is -ve
or
if n is +ve then m is -ve

Looking at (4)

$$mn^3>0$$

i.e. if m is +ve then $$n^3$$ is also +ve (i.e n is +ve)
or
if m is -ve then $$n^3$$ is also -ve (i.e. n is -ve)

but that is not what is told to us so (4) cannot be true.
Manager
Joined: 28 Jan 2004
Posts: 199
Location: India

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10 Jun 2009, 18:07
D.
The sign of MN^3 had to be -ve as either M or N is -ve (because M/N is -ve).
Remaining all the stmt. are either true or false depending on the values of M and N.

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If you would like to discuss this question please re-post it in the respective forum. Thank you!

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Re: fractions   [#permalink] 10 Jun 2009, 18:07
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# fractions

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