Number theory MOC

Falling factorial

The falling factorial is a generalization of the factorial. In Knuth's notation #m/def/num

𝑥𝑛――=𝑛−1∏𝑘=0(𝑥−𝑘)=𝑥(𝑥−1)(𝑥−2)⋯(𝑥−𝑛+1)

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