Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In mathematics, an alternating factorial is the absolute value of the alternating sum of the first n factorials. This is the same as their sum, with the odd-indexed factorials multiplied by –1 if n is even, and the even-indexed factorials multiplied by –1 if n is odd, resulting in an alternation of signs of the summands.

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