Some facts about arithmetic progression (A.P.)

(1) What is a pattern or progression?; (2) Types of progression; (3) What are consecutive terms?; (4) what are successive terms?; (5) What is an A.P. or Arithmetic Progression?; (6) Mathematical Derivation for the General Form of an A.P.; (7) Formula for n^th term of an A.P.; (8) Sum of n terms of an A.P