Two Factorials

David Slauenwhite found this great sign in downtown Wellsboro, Pennsylvania, ten miles from the Grand Canyon, not to be confused with the other Grand Canyon.



Mr. Slauenwhite applies two, huge factorials to make this sign work out. However, he takes a 50% scoring penalty by dividing the 660 by itself.

$${{13!}\over{10!\times6}}+{660\over660}=287$$

This sign is found in downown Wellsboro, Pennsylvania.

Ed.: David Slauenwhite would have had the first sign to ever score over 20 points, however, the 50% scoring deduction took him way down from the 20.1 points he would have had.