In mathematics, a **geometric progression**, also known as a geometric sequence, is a sequence of numbers where each term after the first is found by multiplying the previous one by a fixed, non-zero number called the common ratio. For example, the sequence 2, 6, 18, 54, ... is a **geometric progression** with common ratio 3. Similarly 10, 5, 2.5, 1.25, ... is a geometric sequence with common ratio 1/2. The sum of the terms of a **geometric progression**, or of an initial segment of a **geometric progression**, is known as a geometric series. Wikipedia, Geometrical Progression

See Also

**arithmetical progression**
**Cause and Its Effects**
**exponentiation**
**progression**
**12.18 - Multiple Octave Progression**