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is X odd if X^3 is odd??

This topic has 7 member replies
zealzoom Junior | Next Rank: 30 Posts Default Avatar
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is X odd if X^3 is odd??

Post Fri Nov 10, 2006 10:29 am
Hi ,

Do let me know if this is sufficient to answer the question,,,

Is X odd ??

X^3 is Odd,,,,

Cheers
zeal

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800guy Master | Next Rank: 500 Posts Default Avatar
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Post Fri Nov 10, 2006 9:38 pm
where did this question come from?

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kulksnikhil Senior | Next Rank: 100 Posts Default Avatar
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Post Sat Nov 11, 2006 2:37 am
zealzoom wrote:
that was the problem

is X odd

a) 2x-1 is odd

b) X^3 is odd ..

My answer was B and i was pretty sure about that, but correct answer was E and reason I have already given.

DS,, its real tough to get into it ,,, Sad

Any help??

Zeal
Even I feel B is right answer... for a product to be even, atleast one of the integers must be even. So if both integers are odd then the product remains odd. For x^3 to be odd, all 3 should be odd... so x has to be odd.

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800guy Master | Next Rank: 500 Posts Default Avatar
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Post Fri Nov 10, 2006 9:38 pm
where did this question come from?

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kulksnikhil Senior | Next Rank: 100 Posts Default Avatar
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Post Sat Nov 11, 2006 2:37 am
zealzoom wrote:
that was the problem

is X odd

a) 2x-1 is odd

b) X^3 is odd ..

My answer was B and i was pretty sure about that, but correct answer was E and reason I have already given.

DS,, its real tough to get into it ,,, Sad

Any help??

Zeal
Even I feel B is right answer... for a product to be even, atleast one of the integers must be even. So if both integers are odd then the product remains odd. For x^3 to be odd, all 3 should be odd... so x has to be odd.

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zealzoom Junior | Next Rank: 30 Posts Default Avatar
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Post Sat Nov 11, 2006 8:09 am
800guy wrote:
where did this question come from?
this was question in Kaplan GMAT test ....

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zealzoom Junior | Next Rank: 30 Posts Default Avatar
Joined
28 Jul 2006
Posted:
19 messages
Post Fri Nov 10, 2006 9:33 pm
that was the problem

is X odd

a) 2x-1 is odd

b) X^3 is odd ..

My answer was B and i was pretty sure about that, but correct answer was E and reason I have already given.

DS,, its real tough to get into it ,,, Sad

Any help??

Zeal

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aim-wsc Legendary Member
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Post Fri Nov 10, 2006 2:28 pm
theses nothing wrong in zipper s reply.

he's right. because he assumed that X is an integer.
so technically given condition is not sufficient. we need to know whether X is am integer or not.

pls present the full problem. Smile

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