**SEQUENCE**

A succession of numbers formed according to some definite rule is called a sequence. For example 1, 3, 5, 7,9 ……. is a sequence, here each term of the sequence can be obtained by adding 2 to the preceding term.

**Types of Sequence**

There are two types of sequence.

- Finite sequence
- Infinite sequence

a sequence is said to be a finite or infinite according as it has finite or infinite number of terms.

**Series**** **

If {f_{n}} be a sequence then an expression of the form f_{1} + f_{2} + …… + f_{n} is called series. In other word a series is the sum of the terms of the sequence.

**PROGRESSION**

If the terms of a sequence are written under specific condition then the sequence is called progression. There are three types of progressions.

- Arithmetic Progression
- Geometric Progression
- Harmonic Progression

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