Harder Logarithms for SPM Add Maths Paper 1

Added another 3 past year examples for Logarithms. I categorize them to harder category because these questions involve the change base skill for Log. However, these kind of question only come out in SPM Add Maths paper 1. Anyways, If you would like to have more interaction with me, or ask me more question, or suggest some chapter u want to learn, please add the facebook page at "y=mx+c" or www.facebook.com/maths.video.