This type of progression is called Arithmetic Progression. An arithmetic progression AP or arithmetic sequence is a sequence of numbers such that the difference between the consecutive terms is a constantFor example. Ie an S n S n 1.
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The terms of an arithmetic progression or Arithmetical Progression of n terms added together will give a sum that can be expressed in terms of the first term. Let us take an example to illustrate the application of arithmetic progression formulas in real life. The Formula of Arithmetic Sequence. So it is an arithmetic progression with common difference 3.