واجب الستات

[Ł ớ M ŷ]

c. The novels must be together but the other books can be arranged in any order

The number of ways to arrange the novels is given by 3! = 6 and the other three
books can be arranged in 3! ways with the blocks of novels in any of the four positions in
between giving

4 .(3!) . (3!) = 144