Triangular Number

0

1297

1

+19

What is the 20th triangular number?

AsdmacHK Apr 30, 2017

edited by AsdmacHK Apr 30, 2017

0 users composing answers..

1⁺⁰ Answers

+33660

+3

The n'th triangular number is given by n(n+1)/2

Just plug in 20 for n.

Alan Apr 30, 2017

1 Online Users