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If x and y are consecutive odd integers, what is the sum of

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If x and y are consecutive odd integers, what is the sum of [#permalink] New post 22 Mar 2008, 01:01
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25. If x and y are consecutive odd integers, what is the sum of x and y?
(1) The product of x and y is negative.
(2) One of the integers is equal to –1.
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Jimmy Low, Frankfurt, Germany
Blog: http://mytrainmaster.wordpress.com
GMAT Malaysia: http://gmatmalaysia.blogspot.com

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Joined: 04 May 2006
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Schools: CBS, Kellogg
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Re: 1000DS: Section 2 Question 25 [#permalink] New post 22 Mar 2008, 01:42
jimmylow wrote:
25. If x and y are consecutive odd integers, what is the sum of x and y?
(1) The product of x and y is negative.
(2) One of the integers is equal to –1.


C.
x and y odd
x = y+2 (if x<y)
y=x+2 (if y<x)
we do not know the order, so

1. x*y <0, we know only x and y are different signs. not sufficient
2. give you nothing about the other, the other can bigger or smaller than the one given

1 and 2 combine: sufficient
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Re: 1000DS: Section 2 Question 25 [#permalink] New post 22 Mar 2008, 05:44
wouldnt this be A ?

If we know that the product is negative, and the numbers are consecutive, only -1 and 1 works.

regardless of which one is x and which is y, the sum is always the same.
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Re: 1000DS: Section 2 Question 25 [#permalink] New post 22 Mar 2008, 06:52
Ans is A. I am interested to know the logic/principle behind each statement.
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Jimmy Low, Frankfurt, Germany
Blog: http://mytrainmaster.wordpress.com
GMAT Malaysia: http://gmatmalaysia.blogspot.com

Re: 1000DS: Section 2 Question 25   [#permalink] 22 Mar 2008, 06:52
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