How many ways can seven books be distributed to Robin, Lily, and Alexandria, such that two books are distributed to Robin, two books are distributed to Lily, and three books are distributed to Alexandria? Justify your answer with a written explanation.

Mahnoor randomly selects times to walk into a local restaurant and observe the type of music being played she found that the restaurant was playing country 11 times rock & roll 17 times and blues 8 times use the observed frequencies to create a probability model for the type of music the restaurant is playing the next time mahnoor walks in.