Just the answer, I don't need an explanation , faster

Question 2 2 Points There are two different Geography books, five different Natural Sciences books, three different History books and four different Mathematics books on a shelf. In how many different ways can they be arranged if all the books of the same subjects stand together? 14!/(21+51 +3! + 4!) CT B 2!+5! + 3! + 4! 14!/(21 x 5! x 31 x 4!) D) 21 x 51 x 3 x 4! x 4! 45 minutes remaining