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

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Manager
Joined: 21 Feb 2007
Posts: 80
If x and y are prime numbers, is y(x-3) odd? 1>x>10 [#permalink]

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15 Oct 2007, 15:41
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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

1>x>10
2>y<3

Director
Joined: 03 May 2007
Posts: 872
Schools: University of Chicago, Wharton School
Re: x & y prime [#permalink]

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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

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
Joined: 21 Feb 2007
Posts: 80

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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
VP
Joined: 09 Jul 2007
Posts: 1100
Location: London
Re: x & y prime [#permalink]

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15 Oct 2007, 20:28
abiswas wrote:
If x and y are prime numbers, is y(x-3) odd?

1>x>10
2>y<3

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, 12:10, edited 3 times in total.
VP
Joined: 09 Jul 2007
Posts: 1100
Location: London

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16 Oct 2007, 12:10
refer to my post above
Director
Joined: 03 May 2007
Posts: 872
Schools: University of Chicago, Wharton School
Re: x & y prime [#permalink]

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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.
Intern
Joined: 10 Aug 2007
Posts: 22
Re: x & y prime [#permalink]

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17 Oct 2007, 00:19
[quote="Fistail"][quote="abiswas"]If x and y are prime numbers, is y(x-3) odd?

1. x>10
2. y<3

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] 17 Oct 2007, 00:19
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