What is the sum of a certain pair of consecutive odd integers?
(1) At least one of the integers is negative.
(2) At least one of the integers is positive
(1) could be (-1,1) sum is zero
could be (-3,-1) sum is -4
(2) could be(1,3) sume is 4
could be (-1,1) sum is 0
(1) & (2)
Has to be (-1,1) and sum is zero