The number of different ways that you can arrange 15 different items is given by the permutations of 15 things taken 15 at a time. That is 15 factorial, or 1,307,674,368,000.
35,280
you can arrange 8 pictures 28 different ways
There are six different ways to arrange the letters XYZ... XYZ XZY YXZ YZX ZXY ZYX
4
1 time
3 items (or people) can line up in 6 different sequences. 6 items (or people) can line up in 720 different sequences.
15C3 = 455
35,280
you can arrange 8 pictures 28 different ways
5
you can arrange three beads 9 different ways.
120 ways
8
8! = 40320 ways.
There are 30 ways.
24 ways
24 ways