FORM THREE MATHEMATICS: Sequences and series- How to derive formula for sum of n terms of an AP

In this video lesson the viewer is taken through the steps in deriving the formula for sum of AP.
An example in which the formula is applied in working out a question is given.
In the next video more examples will be done.

[hassannoor]

Kumbe ilikuwa derivations nilidhana I had to know all those overhead. Thanks sir 💯❤️

[Lil_gathira]

but you can just teach us how to go through the questions instead of derivation of formulae