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2. Factorial - Wikipedia

   en.wikipedia.org/wiki/Factorial

   In mathematics, the factorial of a non-negative integer, denoted by ! , is the product of ... is the sequence of initial digits of some factorial number in that base.

3. Factorial number system - Wikipedia

   en.wikipedia.org/wiki/Factorial_number_system

   The factorial number system is sometimes defined with the 0! place omitted because it is always zero (sequence A007623 in the OEIS). In this article, a factorial number representation will be flagged by a subscript "!". In addition, some examples will have digits delimited by a colon. For example, 3:4:1:0:1:0! stands for

4. Double factorial - Wikipedia

   en.wikipedia.org/wiki/Double_factorial

   In mathematics, the double factorial of a number n, denoted by n‼, is the product of all the positive integers up to n that have the same parity (odd or even) as n. [1] That is, n ! ! = ∏ k = 0 ⌈ n 2 ⌉ − 1 ( n − 2 k ) = n ( n − 2 ) ( n − 4 ) ⋯ . {\displaystyle n!!=\prod _{k=0}^{\left\lceil {\frac {n}{2}}\right\rceil -1}(n-2k ...

5. Falling and rising factorials - Wikipedia

   en.wikipedia.org/wiki/Falling_and_rising_factorials

   In mathematics, the falling factorial ... When is a positive integer, () gives the number of n-permutations (sequences of distinct elements) from ...

6. Derangement - Wikipedia

   en.wikipedia.org/wiki/Derangement

   (n factorial) is the number of n-permutations; !n (n subfactorial) is the number of derangements – n-permutations where all of the n elements change their initial places. In combinatorial mathematics , a derangement is a permutation of the elements of a set in which no element appears in its original position.

7. List of mathematical series - Wikipedia

   en.wikipedia.org/wiki/List_of_mathematical_series

   2.4 Modified-factorial denominators. ... allowing the result to be computed in constant time even when the series contains a large number of ... (mathematics) List of ...

8. Obama vs. Romney Electoral Map - elections.huffingtonpost.com

   elections.huffingtonpost.com/2012/romney-vs...

   Maps and electoral vote counts for the 2012 presidential election. Our latest estimate has Obama at 332 electoral votes and Romney at 191.

9. List of factorial and binomial topics - Wikipedia

   en.wikipedia.org/wiki/List_of_factorial_and...

   This is a list of factorial and binomial topics in mathematics. ... Factorial; Factorial moment; Factorial number system; Factorial prime; Gamma distribution;