Each triangle is a combination of 3 out of 6 lines. With n=6 and r=3, nCr = 20.
Here's a new, more interesting math problem. How many triangles? https://nyti.ms/2YKDk9f pic.twitter.com/8s76GRF7C0
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Bingo!
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Not completely cold.
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6!/(3!(6-3)!)=20. Loved your article. Hated the original “problem”
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Thank you!
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Cracks on my iPhone screen complicating matters!!
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That's the best reason for a new iPhone!
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This cropped image makes it unclear as to where each line segment ends, which can lead people to assume that the image border can be used as a side to form other triangles.
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Sorry about that. I uploaded the image, and Twitter does as Twitter does. Another reason to read the article, which includes the full uncompressed image.
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