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You are at the section Fun With Math-Triangulars

Fun With Math-Triangulars

A Triangular is where you add the first n natural numbers to form a sum.
0? = 0
1? = 1 = 1
2? = 1 + 2 = 3
3? = 1 + 2 + 3 = 6
4? = 1 + 2 + 3 + 4 = 10
5? = 1 + 2 + 3 + 4 + 5 = 15
6? = 1 + 2 + 3 + 4 + 5 = 6 = 21
To put it this way:

1 +2= 3 +3= 6 +4= 10 +5= 15 +6= 21...

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