Question

In how many ways can 5 toy animals be arranged in a line on a shelf if one of the toys is a tortoise and it must be at the end of the line?

Answer 1

1 2 3 4 5
1 2 4 3 5
1 3 2 4 5
1 3 4 2 5
1 4 2 3 5
1 4 3 2 5
2 1 3 4 5
2 1 4 3 5
2 3 1 4 5
2 3 4 1 5
2 4 1 3 5
2 4 3 1 5
3 1 2 4 5
3 1 4 2 5
3 2 1 4 5
3 2 4 1 5
3 4 1 2 5
3 4 2 1 5
4 1 2 3 5
4 1 3 2 5
4 2 1 3 5
4 2 3 1 5
4 3 1 2 5
4 3 2 1 5

24