Topics not taught
I practised some questions of triangles and progression and series and I noticed some questions used some formulas/method which were not taught. Like in triangles it something related to properties of altitudes and in series the question had to be solved using AM-GM. Also in the PYQs of UGAT one question needed AGP which was also not taught.
So is this thing alright or am i missing something?

Any shortcut to solve this?
