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Re:Ask HN: Is Knuth's TAOCP worth the time and effort? (2023) by cschmidt on Tuesday November 28, 2023 @07:19AM (#38444937)
One level 50 problem was Exercise 1.2.6.63:

"Develop computer programs for simplifying sums that involve binomial coefficients"

Which was solved in the book titled "A = B":

https://www2.math.upenn.edu/~wilf/AeqB.html

or

https://www.amazon.com/B-Marko-Petkovsek/dp/1568810636

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