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math challenge II-A combinatorics 7.30

 
 
Picture of Zeyin Wu
math challenge II-A combinatorics 7.30
by Zeyin Wu - Friday, 1 October 2021, 5:04 AM
 

I have no idea about what this question is asking.

What does ∑k=1nFk=Fn+2−1∑k=1nFk=Fn+2−1 even mean?