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Question: What is Sequence ?

Answer:

A sequence is a set of numbers in a specified order. It is normally defined by some rule so that a formula can be given for a typical member of the sequence.

For example,
5, 8, 11, 14, 17, ..., 3n + 2
6, 9, 14, 21, 30, ..., n2 + 5,... when n is a natural number.