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  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

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#1 2007-06-01 04:36:17

shocamefromebay
Member
Registered: 2007-05-30
Posts: 103

weird formula???

does any one no what (n!-n) is a formuala for??

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#2 2007-06-01 05:22:20

Ricky
Moderator
Registered: 2005-12-04
Posts: 3,791

Re: weird formula???

Construct an ordered list of n objects.  It's the number of permutations of n objects where each map does not have the property where there is exactly one element mapped to itself and all other elements are mapped to their successor in a circular manner.

big_smile


"In the real world, this would be a problem.  But in mathematics, we can just define a place where this problem doesn't exist.  So we'll go ahead and do that now..."

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#3 2007-06-01 06:37:22

shocamefromebay
Member
Registered: 2007-05-30
Posts: 103

Re: weird formula???

o0o. hmmm but i was also wondering is ther any like weird pattern with the formula???like number patterns??

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