If "1" is an operation symbol, and 1! = 1; 2! = 2x1; 3! = 3x2x1; 4! = 4x3x1 Then the value of 100! △ 99! Is?

If "1" is an operation symbol, and 1! = 1; 2! = 2x1; 3! = 3x2x1; 4! = 4x3x1 Then the value of 100! △ 99! Is?


1!=1
2!=2x1 = 2x 1!
3!=3x2x1=3x 2!
4!=4x3x2x1=4x 3!
……
So 100! = 100 x 99!
100!/ 99!= 100