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Is x > 3 ? 1. (x-3)(x-2)(x-1) > 0 2. x > 1

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Amit05
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Is x > 3 ? 1. (x-3)(x-2)(x-1) > 0 2. x > 1 [#permalink] Is x > 3 ? 1. (x-3)(x-2)(x-1) > 0 2. x > 1   17 Nov 2007, 06:33
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A
B
C
D
E

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(N/A)

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100% (00:00) correct 0% (00:00) wrong based on 3 sessions
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Is x > 3 ?

1. (x-3)(x-2)(x-1) > 0
2. x > 1


Could anyone please explain ?



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alrussell
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Re: Is x > 3 ? 1. (x-3)(x-2)(x-1) > 0 2. x > 1 [#permalink] Is x > 3 ? 1. (x-3)(x-2)(x-1) > 0 2. x > 1   17 Nov 2007, 09:23
Amit05 wrote:
Is x > 3 ?

1. (x-3)(x-2)(x-1) > 0
2. x > 1


Could anyone please explain ?


I make it C I think.. though I'd like to see the OA.

Statement 1 - if x is 1, 2, 3, or 4, the statement is incorrect, thus, if x is positive, then it must be above 3. However, if x is negative, then it may perhaps work. if x is -2, then the statement is correct.

Statement 2 - on it's own is insufficient - x can be anywhere between 1 and 3...

Together though it tells us x is a positive number above 3...

I think...
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Re: Is x > 3 ? 1. (x-3)(x-2)(x-1) > 0 2. x > 1 [#permalink] Is x > 3 ? 1. (x-3)(x-2)(x-1) > 0 2. x > 1   17 Nov 2007, 09:34
Amit05 wrote:
Is x > 3 ?

1. (x-3)(x-2)(x-1) > 0
2. x > 1


Could anyone please explain ?


A. nice one as x>3. if not (x-3)(x-2)(x-1) will be either 0 or -ve.
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Re: Is x > 3 ? 1. (x-3)(x-2)(x-1) > 0 2. x > 1 [#permalink] Is x > 3 ? 1. (x-3)(x-2)(x-1) > 0 2. x > 1   17 Nov 2007, 09:42
Amit05 wrote:
Is x > 3 ?

1. (x-3)(x-2)(x-1) > 0
2. x > 1


Could anyone please explain ?


Clearly A, just draw a number line and everything will be clear
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Re: Is x > 3 ? 1. (x-3)(x-2)(x-1) > 0 2. x > 1 [#permalink] Is x > 3 ? 1. (x-3)(x-2)(x-1) > 0 2. x > 1   17 Nov 2007, 09:42
Why are you all assuming that x is an integer ?

Is x > 3 ?

statement 1

(x-3)(x-2)(x-1) > 0

This will be true when:

(x-3), (x-2) and (x-1) are positive (i.e. x=4 {1,2,3})

(x-1) is positive and (x-2), (x-3) are negative (i.e x=1.5 {0.5,-1.5,-2.5}

insufficient

statement 2

clearly insufficient

both statements

still insufficient

statement 2 doesn't add any new information

so the answer is (E)

:)
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jimmyjamesdonkey
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Re: Is x > 3 ? 1. (x-3)(x-2)(x-1) > 0 2. x > 1 [#permalink] Is x > 3 ? 1. (x-3)(x-2)(x-1) > 0 2. x > 1   17 Nov 2007, 16:43
Killer, I see your point but still saying A.

I forget the rule, but if you a bunch of #s together is equal to 0, then you can set each one individually to zero and solve. Something like that. I did the following

A.

x-3>0
x-2>0
x-1>0

X > 3 suff.

Killer, Also you said it yourself. You forget this is a yes/no question....Statement 1 is true when we have integers. That is how we knows it is a positive.

B. x>1 not suff.
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alrussell
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Re: Is x > 3 ? 1. (x-3)(x-2)(x-1) > 0 2. x > 1 [#permalink] Is x > 3 ? 1. (x-3)(x-2)(x-1) > 0 2. x > 1   17 Nov 2007, 17:52
jimmyjamesdonkey wrote:
Killer, I see your point but still saying A.

I forget the rule, but if you a bunch of #s together is equal to 0, then you can set each one individually to zero and solve. Something like that. I did the following

A.

x-3>0
x-2>0
x-1>0

X > 3 suff.

Killer, Also you said it yourself. You forget this is a yes/no question....Statement 1 is true when we have integers. That is how we knows it is a positive.

B. x>1 not suff.


I dont follow. E seems right... I think KS is correct no?

If X is 1.5, then we end up with -1.5 x -0.5 x 0.5 = 0.325 so answer is no

If X is 4, then we end up with 1 x 2 x 3 = 6 so answer is yes.

Thus Statement 1 is insuff.

As KS said - both numbers also fit within statement 2. 1.5 > 1 as is 6.

Thus E.
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Re: Is x > 3 ? 1. (x-3)(x-2)(x-1) > 0 2. x > 1 [#permalink] Is x > 3 ? 1. (x-3)(x-2)(x-1) > 0 2. x > 1   17 Nov 2007, 22:15
KillerSquirrel wrote:
Why are you all assuming that x is an integer ?

Is x > 3 ?

statement 1

(x-3)(x-2)(x-1) > 0

This will be true when:

(x-3), (x-2) and (x-1) are positive (i.e. x=4 {1,2,3})

(x-1) is positive and (x-2), (x-3) are negative (i.e x=1.5 {0.5,-1.5,-2.5}

insufficient

statement 2

clearly insufficient

both statements

still insufficient

statement 2 doesn't add any new information

so the answer is (E)

:)


You Rock man .. Got it. I had that integer thing in my mind but was to lazy to give it a try ..



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Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
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Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
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Re: Is x > 3 ? 1. (x-3)(x-2)(x-1) > 0 2. x > 1 [#permalink]
17 Nov 2007, 22:15
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