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

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

1>x>10
2>y<3

What should the answer be?



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Re: If x and y are prime numbers, is y(x-3) odd? 1>x>10 [#permalink] New post   15 Oct 2007, 15:54
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.
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Re: If x and y are prime numbers, is y(x-3) odd? 1>x>10 [#permalink] New post   15 Oct 2007, 16:38
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
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Re: If x and y are prime numbers, is y(x-3) odd? 1>x>10 [#permalink] New post   Updated on: 16 Oct 2007, 12:10
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

Originally posted by Ravshonbek on 15 Oct 2007, 20:28.
Last edited by Ravshonbek on 16 Oct 2007, 12:10, edited 3 times in total.
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Re: If x and y are prime numbers, is y(x-3) odd? 1>x>10 [#permalink] New post   16 Oct 2007, 12:10
refer to my post above
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Re: If x and y are prime numbers, is y(x-3) odd? 1>x>10 [#permalink] New post   16 Oct 2007, 23:55
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.
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Re: If x and y are prime numbers, is y(x-3) odd? 1>x>10 [#permalink] New post   17 Oct 2007, 00:19
Fistail wrote:
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.


I think this explanation is simple, clear, and correct :)!



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Re: If x and y are prime numbers, is y(x-3) odd? 1>x>10 [#permalink]
17 Oct 2007, 00:19
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