What is the answer to 1/20 x 1/19 x 1/18 x 1/17 x 1/16 x 1/15 x 1/14 x 1/13 x 1/12 x 1/11 x 1/10 x 1/9 x 1/8 x 1/7 x 1/6 x 1/5 x 1/4 x 1/3 x 1/2 x 1
That is 1 divided by 20 factorial.
1 / 20!
20!=2432902008176640000
So it is 1/that number.
20! Gives You the number of different orders you can arrange 20 objects in.
It is LOTS !!!