fozzzy wrote:
If a^5b^3c^6 < 0, is abc < 0?
(1) b < 0
(2) c > 0
Any alternative solutions?
(1) b < 0
(2) c > 0
Any alternative solutions?
You can also do it so,
a^5b^3c^6 < 0 = (abc)^3 * a^2c^3 < 0
(1) b< 0 this doesn't tell us anything about the left hand side of the inequality
Insufficent
(2) c > 0 , now this means that the second term in the modified left hand side .. a^2c^3 >0. Thus the other term abc^3 < 0. This implies that
abc < 0
Sufficient
Thus the answer is B