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# Is M < 0 ? 1. -M = |-M| 2. M^2 = 9 Your thoughts and

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VP
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Is M < 0 ? 1. -M = |-M| 2. M^2 = 9 Your thoughts and [#permalink]

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10 Oct 2008, 16:30
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Is $$M < 0$$ ?

1. $$-M = |-M|$$
2. $$M^2 = 9$$

Your thoughts and solutions please?
Senior Manager
Joined: 21 Apr 2008
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Location: Motortown
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Re: Absolute value of M [#permalink]

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10 Oct 2008, 16:51
A

1. -m =|-m|
-m = m
2m = 0
m= 0

Is m<0 ? NO
Sufficient

2. m = -3 or 3
Not Sufficient
Manager
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Re: Absolute value of M [#permalink]

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10 Oct 2008, 17:04
A:
we are comparing positive value(righthand side's) with negative values(-m)..means m must be negative number : m<0 yes

A is suff.

B: m=3 or -3 not suff.

IMO :A
VP
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Re: Absolute value of M [#permalink]

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10 Oct 2008, 18:58
vishalgc wrote:
A:
we are comparing positive value(righthand side's) with negative values(-m)..means m must be negative number : m<0 yes

A is suff.

B: m=3 or -3 not suff.

IMO :A

M *cant be negative*.

The only number which satisfies the condition in statement 1 is 0

From statement 2 we get 2 answers +3 and -3. We cannot say for sure if M is -ve or +ve.

So answer is A
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Re: Absolute value of M   [#permalink] 10 Oct 2008, 18:58
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# Is M < 0 ? 1. -M = |-M| 2. M^2 = 9 Your thoughts and

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