A Walk Through Combinatorics 4th Ed. 4. 2. Quick Check 3.
Quick Check 2 is similar.
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*TYPO: The label beneath the sigma should eventually read (a-1)+(b-1)+c=n-2, not (a-1)+(b-1)+c=n
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Worked math problems in subjects I'm interested in. They may not be the best or the most elegant solutions but they're right (I think). Scroll to the top-left to see a list of books I have solutions to.
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