Which one of the following is a triangular number?, 2, 4, 5, 6, 0, 12, What is the 6th triangular number, 1, 6, 10, 15, 21, 69

Triangular numbers

Edetabel

Visuaalne stiil

Valikud

Vaheta malli

Kas taastada automaatselt salvestatud ?