What-is-the-subfactorial-function-i-e-x-

Question Number 2932 by Filup last updated on 30/Nov/15

What is the subfactorial function ?

i . e .! x

Commented by 123456 last updated on 30/Nov/15

number of dessaragment

Commented by Rasheed Soomro last updated on 01/Dec/15

Y o u m e a n^{'} {d i s a r r a n g e m e n t}^{'} ?

Commented by 123456 last updated on 02/Dec/15

yes

Answered by 123456 last updated on 02/Dec/15

number of dessaragment

! 3 = 2

(1, 2, 3) \Rightarrow (3, 1, 2), (2, 3, 1)

! n = n \cdot! (n - 1) + {(- 1)}^{n}

! n ⩽ n!

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