A = B cover
A = B
by Marko Petkovsek, Herbert S Wilf, Doron Zeilberger
ISBN: 1568810636
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cschmidt · 2023-11-28 · Original thread
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