Question 850402
Here let me help you,

11P11 means nPr, where in n=r or 11=11 got it?

11P11 means Permutation of 11 taken 11 at a time,

{{{11P11 = ((n!)/(n-r)!)}}}
{{{11P11 = (11!)/(11-11)!}}}
{{{11P11 = (11!)/(0!)}}}
{{{11P11 = 39916800}}}

Hope that helps!

<3rda33