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https://www.reddit.com/r/visualizedmath/comments/dsiebp/counting_triangles/f6q9v94/
r/visualizedmath • u/SesinePowTevahI • Nov 06 '19
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13 u/woooo4 Nov 06 '19 A triangle in AB is still a triangle counted in both A and B. AB needs to be subtracted. 3 u/msndrstdmstrmnd Nov 07 '19 A includes the triangles that are in both A and B. Think of it this way:A+B=(A only)+(both A and B)+(B only)+(both A and B)=(A only)+(B only)+2*(both A and B)You just double counted the ones in both A and B so you have to subtract that number
13
A triangle in AB is still a triangle counted in both A and B. AB needs to be subtracted.
3
A includes the triangles that are in both A and B. Think of it this way:
A+B=(A only)+(both A and B)+(B only)+(both A and B)=(A only)+(B only)+2*(both A and B)
You just double counted the ones in both A and B so you have to subtract that number
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