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Question-87884




Question Number 87884 by M±th+et£s last updated on 06/Apr/20
Answered by mind is power last updated on 06/Apr/20
!k ?
$$!{k}\:? \\ $$
Commented by M±th+et£s last updated on 06/Apr/20
subfactorial
$${subfactorial} \\ $$
Commented by M±th+et£s last updated on 06/Apr/20
also called the derangement number
$${also}\:{called}\:{the}\:{derangement}\:{number} \\ $$
Commented by mind is power last updated on 07/Apr/20
ok thanx i will see definition i never meet it befor
$${ok}\:{thanx}\:{i}\:{will}\:{see}\:{definition}\:{i}\:{never}\:{meet}\:{it}\:{befor} \\ $$

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