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If \(a^4b^3c^7>0,\) then which of the following must be true?
I. \(\dfrac{b}{c}>0\)
II. \(ab>0\)
III. \(abc>0\)
A. I only
B. II only
C. III only
D. I and II only
E. I and III only
Answer: A
Source: GMAT Club Tests
I. \(\dfrac{b}{c}>0\)
II. \(ab>0\)
III. \(abc>0\)
A. I only
B. II only
C. III only
D. I and II only
E. I and III only
Answer: A
Source: GMAT Club Tests
