georgeung wrote:Is y < z ?
(1) y + z = 1
(2) y^2 < z^2
[spoiler]OA: C[/spoiler]
statement 1)
try some numbers: y could be -2 and z could be 3 ---> y<z or y could be 3 and z could be -2 -->y>z insufficient
statement 2)
y^2<z^2
y^2-z^2<0
(y+z)(y-z)<0
therefore y<-z or y<z insufficient
combine
if y+z=1 then (1)(y-z)<0-->y<z sufficient
Answer C
you got this man!
