Hello young mathematicians.
Arithmetic Progressions, famously called AP is one of the most alluring topics in high school mathematics. I have made this note in order to compile all proof based problems on AP. You need to follow the following rules:
Post a problem of AP and also its solution. The problem can only be proof based.
The posted problem might be original, or borrowed from variety of resources.
These problems altogether will help us prepare for various competitive examinations.