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How an SAT question became a mathematical paradox. Head to https://brilliant.org/veritasium to start your free 30-day trial, and the first 200 people get 20%...
It explains the answer is 4 before the 5 minute mark.
Part of the reason is because it goes into the story of the SAT being wrong and a student being the one to catch it, which I found interesting.
After that it mathematically proves it several different ways and then shows how it relates to some real problems in astronomy.