Oh, dude, 1000000000 factorial is a big ol' number! It's like 1 followed by 9 zeros, multiplied by all the numbers leading up to it. So, technically, it's 1000000000 x 999999999 x 999999998... all the way down to 1. But like, who's got time to calculate that? Just know it's a massive number, man.
3.857142857 in fraction form = 3857142857/1000000000 3.857142857 * 1000000000/1000000000 = 3857142857/1000000000
factorial of -1
1000000000-789068798 = 210931202
33.3% * 1000000000= 0.333 * 1000000000= 333000000or 333 million
Factorial 6 = 720