Permutation and Combinations

Question

9 different books are to be arranged on a book-shelf. 4 of these books were written by Shakespeare, 2 by Dickens and 3 by Conrad. How many possible permutations are there if


(a) the books by Dickens are separated from each other?

(b) the books by Conrad are separated from each other?

Answer 1

Daniel,

 

I just answered the first part of this on your previous post. 

 

What are your thoughts on how to do the other part?