Khan/khan-exercises — pull request #18307 by imranghory (2012-04-02 20:40:54+00:00)
Title: Logarithms 2:  Added a problem for log_b(a) =  log(a) / log (b)

Current logarithms 2 exercise doesn't have any problems that test the student for the final log property discussed in the associated video (log_b(a) = log(a) / log (b)) so added a problem dealing with it.