# Triangular Numbers

### Description

Some essential Formulae for Triangular Numbers
Flashcards by Alex Burden, updated more than 1 year ago
 Created by Alex Burden about 7 years ago
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## Resource summary

 Question Answer Sum of AP: Image: Tri Num 6a (image/png) Image: Tri Num 6b (image/png) Sum of GP: Image: Tri Num 7a (image/png) Image: Tri Num 7b (image/png) AP with d=1: Image: Tri Num 8a (image/png) Image: Tri Num 8b (image/png) Image: Tri Num 9a (image/png) Image: Tri Num 9b (image/png) Image: Tri Num 10a (image/png) Image: Tri Num 10b (image/png) Image: Tri Num 11a (image/png) The sum of the first n even + the sum of the first n odd = the sum of the first 2n Image: Tri Num 11b (image/png) Image: Tri Num 10a (image/png) Image: Tri Num 10c (image/png) Type 1 Partial Fractions Image: Tri Num 12a (image/png) Type 2 Partial Fractions Image: Tri Num 12b (image/png) Type 3 Partial Fractions Image: Tri Num 12c (image/png)

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