(gp) harmonic progression (hp) a progression is a special type of sequence for which it is possible to obtain a formula for the nth term. the arithmetic progression is the most commonly used sequence in maths with easy to understand formulas. definition 1: a mathematical sequence ...
each term, except the first term, is obtained by adding a fixed number to its previous term. This fixed number is known as the common difference and is denoted by 'd'. The first term of an arithmetic progression is usually denoted