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/sci/ - Science & Math

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8333021 No.8333021 [Reply] [Original]

Quick question about mathematics.

What is the sequence or mathematical concept called of the number of triangles between a certain number of points?

For example:
1P = 0
2P = 0
3P = 1
4P = 4
5P = 8

And so on.

Only triangles between points, not new ones created by those triangles.

>> No.8333028

>>8333021
>concep
>of the number of triangles

tribbing

>> No.8333032

>>8333021
It's the binomial coefficient [math]C^{n}_{3}[/math]
Also it's 10 for 5, not 8.

>> No.8333034

>>8333032
I meant [math]C^{3}_{n}[/math] sorry.

>> No.8333045
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8333045

>>8333034

Thanks, that was what I was looking for.