Stuck with easy number properties....:(

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joyseychow: Master | Next Rank: 500 Posts; Posts: 125; Joined: Mon Dec 15, 2008 9:24 pm

by joyseychow » Tue Jun 09, 2009 6:29 am

A certain list consists of several different integers. Is the product of all the integers in the list positive?

(1) The product of the greatest and smallest of the integers in the list is positive

(2) There is an even number of integers in the list

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Source: Beat The GMAT — Data Sufficiency | Tue Jun 09, 2009 6:29 am

abhinav85: Master | Next Rank: 500 Posts; Posts: 179; Joined: Mon Dec 29, 2008 4:41 am; Thanked: 2 times

by abhinav85 » Tue Jun 09, 2009 6:33 am

IMO E

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iamcste: Legendary Member; Posts: 940; Joined: Tue Aug 26, 2008 3:22 amFollowed by: 1 member; Thanked: 55 times

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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