1. Find the number of ways to arrange 5 seniors and 4 juniors in a row of 9 seats if all the seniors must sit together. 2. Six books are selected randomly from a cabinet containing 4 history books,

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1. Find the number of ways to arrange 5 seniors and 4 juniors in a row of 9 seats if all the seniors must sit together.

2. Six books are selected randomly from a cabinet containing 4 history books, 7 science books and 3

geography books. What is the probability of getting 4 science books and 2 history books?

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