Consider the following sequences.

a. 1, 6, 11, 16, ... … …

b. 6, 2, -2, -6, … … … …

c. 3, 4.5, 6, 7.5, … … …

In the first sequence, each term is increased by 5 than the preceding term. In the second sequence, each term is decreased by 4 than the
preceding term. Each term in the third sequence is increased by 1.5 than the
preceding term. In each of the above sequences, the difference between a term
and its preceding term is equal or constant. Such a sequence is said to be an
Arithmetic Sequence or Arithmetic Progression.

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