Here's a new, more interesting math problem. How many triangles? https://nyti.ms/2YKDk9f pic.twitter.com/8s76GRF7C0
Science reporter at the New York Times. Pluto, dinosaurs, NASA, viral math & more...
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Here's a new, more interesting math problem. How many triangles? https://nyti.ms/2YKDk9f pic.twitter.com/8s76GRF7C0
Each triangle is a combination of 3 out of 6 lines. With n=6 and r=3, nCr = 20.
The image in the article doesn't show those borders. If we include them anyway, each horizontal edge adds 4C2=6 triangles, and each vertical edge adds 1, for a total of 34.
The problem does not include the borders. I have to figure out how to adjust the image to the peculiarities of Twitter.
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