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Mathematics 8 Online
OpenStudy (anonymous):

The number of triangles whose vertices are the the vertices of the vertices of an octagon but none of whose sides happen to come from the sides of the octagon.

OpenStudy (anonymous):

@hartnn Can you please help?

hartnn (hartnn):

|dw:1444576861098:dw| Lets take the vertices of the octagon as A,B,C,D,E,F,G,H

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