Question 1196637
<br>
(3n+3)! is just (3n-3)! with several additional factors....<pre>

     (3n-3)!
    --------- =
     (3n+3)!

                      (3n-3)!
  ----------------------------------------------- =
   ((3n-3)!)((3n-2)(3n-1)(3n)(3n+1)(3n+2)(3n+3))

                    1
  --------------------------------------
   ((3n-2)(3n-1)(3n)(3n+1)(3n+2)(3n+3))</pre>
That expession can be written differently if you want....<br>