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Falling and rising factorials
In a falling factorial, the factors are gradually reduced by 1
In a rising factorial, the factors are gradually increased by 1
Explanation
The first few falling factorials are
The first few rising factorials are
< 1 2 >
In a falling factorial, the factors are gradually reduced by 1
In a rising factorial, the factors are gradually increased by 1
The first few falling factorials are
The first few rising factorials are