Which one of the followings is a triangular number?, 17, 16, 21, 28, 2, 5, Which of the following isn’t a triangular number?, 26, 27, 28, 21, 15, 10, What is the fifth triangular number?, 1, 3, 6, 10, 17, 15

Triangular numbers

Ledertavle

Visuell stil

Alternativer

Bytt mal

Gjenopprett automatisk lagring: ?