mértani haladvány betyr engelsk

geometric progression [geometric progressions]▼◼◼◼noun
[UK: ˌdʒɪə.ˈme.trɪk prə.ˈɡreʃ.n̩] [US: ˌdʒiə.ˈme.trɪk prə.ˈɡreʃ.n̩]