STMT I.
if both max and min are (+) or (-), statement I holds. However, list with all negatives and odd numbers of elements will produce a negative value. List with all positives and odd numbers of elements will produce positive value. Hence (I) insufficient.
Stmt II.
if number of elements are even, we do not know combination of positive elements and negative elements.
no Suff.
I + II
answer will always be positive regardless of all elements are positives or negatives.
(C)
gmat prep
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Source: Beat The GMAT — Data Sufficiency |
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jackcrystal
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