To find the value of 13!.
The fundamental counting principle .
= 62,270,20,800 \ \
The solution is 62,270,20,800.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=0d01f97314a06047635942948501366b.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=4b80554202e6f4d8e78afcd2a68b731e.png\")
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")