A Common-Sense Guide to Data Structures and Algorithms, Second Edition: number_of_paths implementations are not equivalent (pg. 176/177)

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Thanks for submitting this. While you are correct that the two methods are not identical in this regard, that is by design. I explain there in the text between the two versions that in the simplified version, we are “rigging” the base case of 0 to return 1 for the very sake of simplifying the code. I hope that helps!