Did anyone know (Besides Numberphile) that -1! equals 0!/0 which equals 1/0 ... Dividing by 0 answer Error not -1?
no because it's an integer and you can have -1 dollars as in you ow someone a dollar
-1! means -1*1! = -1*1 = -1
just like
-6^2 = -1*6^2 = -1*36 = -36 (NOT +36)
+537 
