Logarithms are very important in Quantitative Section as question base on formula & sometimes indirect question also come to check its application. Please the whole series of logarithms Tricks For GMAT & MBA exam | Bank PO| Clerk | CAT | SSC/NDA/CDS/other competitive exams.
http://www.youtube.com/timedtext_cs_panel?c=UCfqA_1d0O534sr1iwsoJbhA&tab=2
source
