1. The problem statement, all variables and given/known data 1.) 4 of the books have red covers, 3 have green covers, and another 2 have gray covers. In how many ways can the books be arranged on a shelf if books of the same color must be arranged together? 3. The attempt at a solution 1) I think that the answer here is 3! But here is the answer from my book (4!3!2!)3!