Each week Manhattan GMAT posts a GMAT question on our blog and follows up with the answer the next day. Are you up for the challenge?
If x < y < z but x2 > y2 > z2 > 0, which of the following must be positive?
(A) x3y4z5
(B) x3y5z4
(C) x4y3z5
(D) x4y5z3
(E) x5y4z3
