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

Edetabel

Visuaalne stiil

Valikud

Vaheta malli

Kas taastada automaatselt salvestatud ?