You can arrange them in (20 x 19 x 18 x 17 x 16 x ..... 4 x 3 x 2) ways.
That number is called "20 factorial", and written " 20! ".
It's a big number ... bigger than my calculator can show exactly.
Rounded to the nearest billion, it's
2,432,902,008,000,000,000
24
One... numbers
24 ways
you can arrange three beads 9 different ways.
8
8! = 40320 ways.
4
24
One... numbers
you can arrange 8 pictures 28 different ways
24 ways
you can arrange three beads 9 different ways.
120 ways
7!=5040
8
Only One
There are six, but it is traditional to list them least to greatest,