Before you understand this topic, you are advised to read:
What is Arithmetic Progression ?
As explained in the topic Definition of Arithmetic Progression that each term of arithmetic progressing is obtained by adding a fixed number to its previous term (except it’s first term).
So, this fixed number is known as Common Difference. It is usually denoted as 'd'
Note: Common difference can be positive, negative or even zero.
example (a): 2, 4, 6, 8, 10, 12, 14, 16
Let's consider the above example (a)again, to understand common difference.
AP = 2, 4, 6, 8, 10, 12, 14, 16
Common difference = 4 - 2 or 6 - 4 or 8 - 10 or 10 - 8 or 12 - 10 or 14 - 16 or 16 - 14 i.e 2 in each case.
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