In this question,
from 1 we have
product of greatest and smallest no is positive.
so lets say numbers are -1,-2,-3
product is -1*-3 = 3 which is positive
but the product of all the numbers is negative
hence, we need the number of integers in the set. It can be even or odd.
insuff.
from 2 we have the number of integers as even, but we dont know if the numbers are positive or negative.
insuff.
combining we have the number of integers and also the product of greatest and smallest number.
hence C
GMAT Prep / Number Properties
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