Question 2 * * * has 4*3*2=24 kinds.
When you take the first science and technology book, you can choose three comic books and two literature books. When I am a sophomore, I can choose three comic books and two literary books. When taking the third science and technology book, you can choose three comic books and two literature books. When you take the fourth science and technology book, you can choose three comic books and two literature books, so you use multiplication. )