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# If x and y are prime numbers, is y(x-3) odd? 1>x>10

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Manager
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If x and y are prime numbers, is y(x-3) odd? 1>x>10 [#permalink]  15 Oct 2007, 14:41
If x and y are prime numbers, is y(x-3) odd?

1>x>10
2>y<3

What should the answer be?
Director
Joined: 03 May 2007
Posts: 894
Schools: University of Chicago, Wharton School
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Re: x & y prime [#permalink]  15 Oct 2007, 14:54
abiswas wrote:
If x and y are prime numbers, is y(x-3) odd?

1>x>10
2>y<3

What should the answer be?

D.

1: x is odd and x-3 is even. so irrespective of y, y(x-3) is even.
2: y is even, no matter the value of x, y(x-3) is even.
Manager
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but............ [#permalink]  15 Oct 2007, 15:38
Kaplan sayd D too...
But i think A.
2>y<3 says nothing about x, what if x=3 then (x-3) becomes 0, 2*0 = 0, neither odd nor evn
VP
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Re: x & y prime [#permalink]  15 Oct 2007, 19:28
abiswas wrote:
If x and y are prime numbers, is y(x-3) odd?

1>x>10
2>y<3

What should the answer be?

is the first statement correct?
should not it be the other way around 1<x<10, i answered assuming this not the one on the statment(stem). is not it a typo

D.

in the second statement, is it greater and equal or just greater.
if just greater then it is A. otherwise it is D

Last edited by Ravshonbek on 16 Oct 2007, 11:10, edited 3 times in total.
VP
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[#permalink]  16 Oct 2007, 11:10
refer to my post above
Director
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Re: x & y prime [#permalink]  16 Oct 2007, 22:55
If x and y are prime numbers, is y(x-3) odd?

1. x>10
2. y<3

i guess if the question were posted as above, it would make more sense and i believe i am not changing the question.
Intern
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Re: x & y prime [#permalink]  16 Oct 2007, 23:19
[quote="Fistail"][quote="abiswas"]If x and y are prime numbers, is y(x-3) odd?

1. x>10
2. y<3

What should the answer be?[/quote]

D.

1: x is odd and x-3 is even. so irrespective of y, y(x-3) is even.
2: y is even, no matter the value of x, y(x-3) is even.[/quote]

I think this explanation is simple, clear, and correct !
Re: x & y prime   [#permalink] 16 Oct 2007, 23:19
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# If x and y are prime numbers, is y(x-3) odd? 1>x>10

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