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How do you define multifactorial?I know what it is,but how do you define it?I know how to define factorial.
It can be defined recursively:http://en.wikipedia.org/wiki/Factorial#Multifactorials
The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
Well,if I try n=11,k=3,then11!!!=11*8*5*2(as 11 mod 3=2) =880,is it correct?
Well,thank you,I love solving problems,now,20!!!!,so n=20 and k=4
In mathematics, you don't understand things. You just get used to them.
No explanations, just DGA.
If you can not overcome with talent...overcome with effort.
But,I am confused,if I do 11!!! by the method in wikipedia,I get 11!!!=11(8!!!)=11(8(5!!!))=11(8(5(2!!!)))=11(8(5(1))) [as 0<2<3] =440