Triangular Number

0

1260

1

+19

What is the 20th triangular number?

AsdmacHK Apr 30, 2017

edited by AsdmacHK Apr 30, 2017

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1⁺⁰ Answers

+33615

+3

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

Just plug in 20 for n.

Alan Apr 30, 2017

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