Introduction & Nature of Chapter Index & Critical topics Meaning of nth term of sequence General term of an AP Sum of n terms of AP Common terms in two APs Key points of AP General term of a GP Sum of n/infinite terms of GP Key points of GP Arithmetic-Geometric Progression (AGP) Harmonic Progression (HP) AM, GM, HM Relation between AM and GM Weighted AM, GM Relation between AM, GM & HM Sigma Notation Method of difference