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If x and y are positive integers , is the product xy even

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If x and y are positive integers , is the product xy even [#permalink] New post 29 Jan 2009, 05:47
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If x and y are positive integers , is the product xy even

(1) 5x - 4y is even
(2) 6x + 7y is even
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Re: Is the Product xy even - DS [#permalink] New post 29 Jan 2009, 06:25
krishan wrote:
If x and y are positive integers , is the product xy even

(1) 5x - 4y is even
(2) 6x + 7y is even


D. in either case x and y has to be even.

(1) 5x - 4y is even: x has to be even. suff.
(2) 6x + 7y is even: y has to be even. suff.
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Re: Is the Product xy even - DS [#permalink] New post 29 Jan 2009, 07:43
krishan wrote:
If x and y are positive integers , is the product xy even

(1) 5x - 4y is even
(2) 6x + 7y is even


agree with D.

1) 5x - 4y is even -> x must be multiple of 2
5*2k-4y = 2*(any number) even
sufficient
2)6x + 7y is even[/
y should multiple of 2

even
sufficient
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Re: Is the Product xy even - DS   [#permalink] 29 Jan 2009, 07:43
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