25. If x and y are consecutive odd integers, what is the sum of x and y?
(1) The product of x and y is negative.
(2) One of the integers is equal to –1.
x and y odd
x = y+2 (if x<y)
y=x+2 (if y<x)
we do not know the order, so
1. x*y <0, we know only x and y are different signs. not sufficient
2. give you nothing about the other, the other can bigger or smaller than the one given
1 and 2 combine: sufficient
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