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2!!! = 2 not 1.
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
Hi;
Well,thank you,I love solving problems,now,20!!!!,so n=20 and k=4
Hi;
Well,if I try n=11,k=3,then11!!!=11*8*5*2(as 11 mod 3=2) =880,is it correct?
Hi Harold;
Can't this be another definition
It can be defined recursively:http://en.wikipedia.org/wiki/Factorial#Multifactorials
How do you define multifactorial?I know what it is,but how do you define it?I know how to define factorial. 