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winnerhere
- Master | Next Rank: 500 Posts
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First off, you won't have logarithms in the GMAT.
Secondly: the notation "ln" means that the base (that little "a" written down there) is the irrational number "e" (between 2 and 3). "ln" is called a natural logarithm. The notation should be "log" instead of "ln".
Thirdly, to answer your question, it depends. If X is between 0 and 1, then the logarithm is positive. If X is greater than 1, then the logarithm is negative. It's basically "the reverse" for the case when a is greater than 1.
