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integ odd even ds gmatprep

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integ odd even ds gmatprep [#permalink] New post 07 Mar 2008, 11:40
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If M is a finite set of negative integers, is the total number of integers in M an
odd number?
(1) The product of all the numbers in M is odd.
(2) The product of all the integers in M is negative.
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Re: integ odd even ds gmatprep [#permalink] New post 07 Mar 2008, 11:45
D.

An even product hides the sign of the integers.
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Re: integ odd even ds gmatprep [#permalink] New post 08 Mar 2008, 10:08
bmwhype2 wrote:
D.

An even product hides the sign of the integers.


it may confuse. anyway OA is B

thre might be also an even number of odd integer, the product of which is odd.
i.e. -7*-9*-5*-1= 63*5 which is odd====4 numbers

this holds true also for -11*-9*-5*-7*-1====5 numbers

only the fact that the product is negative tells us that we must have an odd number of intgers
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Re: integ odd even ds gmatprep [#permalink] New post 08 Mar 2008, 19:37
marcodonzelli wrote:
If M is a finite set of negative integers, is the total number of integers in M an
odd number?
(1) The product of all the numbers in M is odd.
(2) The product of all the integers in M is negative.


Ya def. B

1: could be -9*-9*-9* or -9*-9*-9*-9

2: has to be odd
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Re: integ odd even ds gmatprep [#permalink] New post 08 Mar 2008, 21:33
oh ok. thanks... it is B.. Got confused...
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Re: integ odd even ds gmatprep [#permalink] New post 08 Mar 2008, 22:10
nevermind :lol:
Re: integ odd even ds gmatprep   [#permalink] 08 Mar 2008, 22:10
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