zz0vlb wrote:
A certain list consist of several different integers. Is the product of all 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.
(1): the greatest and smallest integer could be both negative or both positive --> insufficient
(2): even number of integers does not point out the sign of the product --> insufficient
(1) + (2): all number are positive or negative and even number
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