等とう比ひ数すう列れつ

noun

geometric progression; geometric sequence

Mathematical term for a sequence where each term after the first is found by multiplying the previous one by a fixed, non-zero number called the common ratio.

• 等とう比ひ数すう列れつの和わの公こう式しきを覚おぼえていますか。

  Do you remember the formula for the sum of a geometric progression?

• この数すう列れつは等とう比ひ数すう列れつで、公こう比ひは2です。

  This sequence is a geometric progression with a common ratio of 2.