Falling and rising factorials - Wikipedia
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A man decides to run a flight of 11 stairs. Sometimes he takes one step, sometimes he takes 2 steps. How many possible ways are there for him to run the stairs? - Quora
Falling and rising factorials - Wikipedia
How to prove the factorial of 1/2 is 0.5√π - Quora
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How to find all solutions to this set of functional differential equations? f'''…(x) = f(f(x)) for any derivative - Quora
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How to determine all pairs (k, n) such that there exists a k-regular graph on n vertexes - Quora
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