Arithmetic Progressions
 The Concept of Arithmetic Progression
 An arithmetic progression is a list of numbers in which the difference between any two consecutive terms is equal.
 In an AP, each term, except the first term, is obtained by adding a fixed number called common difference to the preceding term.
 The common difference of an AP can be positive, negative or zero.
Example 1:

 1. is an AP whose first term and common difference are 3 and 3 respectively.
 2. is an AP whose first term and common difference are 7 and –2 respectively.
 3. is…
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