I think I saw this one on an ancient arab math problems book. But it may be apocryphal, not sure how many tools they would have had, factorial symbols? At any

I think I saw this one on an ancient arab math problems book. But it may be apocryphal, not sure how many tools they would have had, factorial symbols? At any rate they invented algebra so maybe there's something to it Edit: It was the man who counted, definitely apocryphal, as it was written in the 20th century