Problem
There is a book collection which contains 130 books in 9 languages distributed as follows: 10 books in each of 5 latin languages and 20 books in each of 4 germanic languages.
i. If the 3 books have to be in the same language, how many sets of 3 books can be formed?
ii. If 2 books have to be in a latin language and 2 books in a germanic language, how many sets of 4 books can be formed?