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Hook Length Formulas for Partitions and Plane Trees
Quiz
Let Q(n) be the triple mixed hook expression in the Quiz by replacing
the number 1001 by n.
Then
Σ Q(n)x^n
is given by the Euler
pentagonal theorem.
Thus, if n= k(3k+1)/2, then Q(n)=(-1)^k.
Now 1001=(-26)(-3*26+1)/2, so that Q(1001)=(-1)^(-26)=1.
The answer is: 1
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Last update: 2008/04/15