Question 451556
! is a symbol for Factoriel that is defined for positive integer n as a product of all integers that are less or equal to that n:


n! = n*(n-1)*(n-2)* ... * 2*1


 4!= 4*3*2*1
 6!= 6*5*4*3*2*1 = 6*5*4!
 9!= 9*8*7*6*5*4*3*2*1
11!= 11*10*9*8*7*6*5*4*3*2*1 = 11*10*9!


{{{ (6!*11!)/(4!*9!)}}} 
{{{(6*5*4!*11*10*9!)/(4!*9!)}}} , reduce by 4! and 9!
{{{6*5*11*10}}} = 3300


So the value is 3300.