Double factorial

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Double factorial is a method of calculating how many times a number is repeated in a geometric equation. This way, we can calculate the number of times a product is used in its life-time.

The double factorial of n is written as .[1] When n is a positive odd integer, is defined as . When n is an positive even integer, is defined as . By definition, .[2][3]

Related pages[change | change source]

References[change | change source]

  1. "List of Probability and Statistics Symbols". Math Vault. 2020-04-26. Retrieved 2020-09-10.
  2. Weisstein, Eric W. "Double Factorial". mathworld.wolfram.com. Retrieved 2020-09-10.
  3. "Double Factorials and Multifactorials | Brilliant Math & Science Wiki". brilliant.org. Retrieved 2020-09-10.