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Source : KAPLAN CAT Is x odd ? (1) 2x-1 is odd. (2) x is odd

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Source : KAPLAN CAT Is x odd ? (1) 2x-1 is odd. (2) x is odd [#permalink]

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New post 25 Oct 2008, 07:18
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Source : KAPLAN CAT

Is x odd ?

(1) 2x-1 is odd.
(2) x³ is odd.
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Re: DS : Is x odd ? [#permalink]

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New post 25 Oct 2008, 09:52
B

2x-1 is odd means 2x is even means x can be odd or even.

x^3 is odd is there is no even number in the multiplication 3 times. X has to be odd, because its the same number.

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Re: DS : Is x odd ? [#permalink]

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New post 25 Oct 2008, 10:03
amitdgr wrote:
i fell for the same trap


Hmm, What is the common trap that all of us fell for?

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Re: DS : Is x odd ? [#permalink]

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New post 25 Oct 2008, 10:18
Kaplan CAT says "Also don't make the mistake of assuming that x must be an integer. The question stem does not say that x is an integer"

What if x = CUBEROOT(7) ???

then x³ = 7 (odd)

statement 1 says x is an integer
statement 2 tells its odd :)

so C.

I picked B while on test.
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Re: DS : Is x odd ? [#permalink]

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New post 25 Oct 2008, 10:24
amitdgr wrote:
Kaplan CAT says "Also don't make the mistake of assuming that x must be an integer. The question stem does not say that x is an integer"

What if x = CUBEROOT(7) ???

then x³ = 7 (odd)

statement 1 says x is an integer
statement 2 tells its odd :)

so C.

I picked B while on test.


Thanks we should be noticing better. Should not suffer from carry over from statement 1

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Re: DS : Is x odd ? [#permalink]

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New post 25 Oct 2008, 10:46
icandy wrote:
amitdgr wrote:
Kaplan CAT says "Also don't make the mistake of assuming that x must be an integer. The question stem does not say that x is an integer"

What if x = CUBEROOT(7) ???

then x³ = 7 (odd)

statement 1 says x is an integer
statement 2 tells its odd :)

so C.

I picked B while on test.


Thanks we should be noticing better. Should not suffer from carry over from statement 1


I know :(
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Re: DS : Is x odd ? [#permalink]

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New post 25 Oct 2008, 13:06
amitdgr wrote:
Source : KAPLAN CAT

Is x odd ?

(1) 2x-1 is odd.
(2) x³ is odd.


I fell for the same trap :roll:

1. 2x - 1 = Odd
2x = even
x could be even(2) or odd(1), but an ineteger
Not Sufficient

2. X need not be an integer

Together
X is Odd - Sufficient

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Re: DS : Is x odd ? [#permalink]

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New post 25 Oct 2008, 13:32
I fell for the same trap too :lol:

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Re: DS : Is x odd ? [#permalink]

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New post 25 Oct 2008, 21:17
hahaha :) so many of us tripped into the same trap
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Re: DS : Is x odd ? [#permalink]

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New post 26 Oct 2008, 23:09
Same here :o

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Re: DS : Is x odd ? [#permalink]

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New post 27 Oct 2008, 10:50
amitdgr wrote:
Source : KAPLAN CAT

Is x odd ?

(1) 2x-1 is odd.
(2) x³ is odd.


The question for me ok but OE or OA are something misleading or ambigious. Since the question is asking whther x is an odd or even. This is yes/no question. So it excludes all posssibilities other than ODD and EVEN.

Statement 1 is a standard GMAT level information cus it has no ambiguity but Statement 2 is definitely an ambigious one. We can argu that x can be a fraction, but the issue is not a possibility of x being a fraction. The issue in hand here is whether x is odd or even. So the question should exclude all possibility of x being other than odd or even.

I know we can keep on arguing on statement 2 but I for me it (statement 2) is sufficient.
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Re: DS : Is x odd ? [#permalink]

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New post 29 Oct 2008, 00:20
GMAT TIGER wrote:
amitdgr wrote:
Source : KAPLAN CAT

Is x odd ?

(1) 2x-1 is odd.
(2) x³ is odd.


The question for me ok but OE or OA are something misleading or ambigious. Since the question is asking whther x is an odd or even. This is yes/no question. So it excludes all posssibilities other than ODD and EVEN.

Statement 1 is a standard GMAT level information cus it has no ambiguity but Statement 2 is definitely an ambigious one. We can argu that x can be a fraction, but the issue is not a possibility of x being a fraction. The issue in hand here is whether x is odd or even. So the question should exclude all possibility of x being other than odd or even.

I know we can keep on arguing on statement 2 but I for me it (statement 2) is sufficient.



GT, I do not think, stmt2 has ambiguity. Take the example of x = 1,3,5,7,9,..... and x^3 is odd. Also, take x = cube root of 1,3,5,7,9,.... and x^3 is odd. Thus, in one case, x is odd and in the other case it is not odd. That is the reason why stmt2 is not sufficient.

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Re: DS : Is x odd ?   [#permalink] 29 Oct 2008, 00:20
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Source : KAPLAN CAT Is x odd ? (1) 2x-1 is odd. (2) x is odd

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