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.