Answer :
book 1, book 2, book 3, book 4,
book 4, book 3, book 2, book 1
book 2, book 3, book 1, book 4
1, 3, 2, 4
3, 2, 1, 4
3, 2, 4, 1
6 ways :) Hope this helps
book 4, book 3, book 2, book 1
book 2, book 3, book 1, book 4
1, 3, 2, 4
3, 2, 1, 4
3, 2, 4, 1
6 ways :) Hope this helps