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Stuck with easy number properties....:(

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Source: — Data Sufficiency |
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by abhinav85 » Tue Jun 09, 2009 6:33 am
IMO E
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by iamcste » Tue Jun 09, 2009 7:09 am
IMO C


Individually not sufficient

together, we know that

from 1, they have same sign

from 2, whether the list has odd/even numbers

since if we odd no of negative nos, product is negative while if we have odd odd no of positive, product is positive

As we know we have even no of integres, irrespective of the sign, product of all the integers will be positive
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