There are 4 different science and technology books on the first floor of the bookshelf, 3 different comic books on the second floor, and 2 different literature books on the third floor. 1 book, how many different methods are there?
书架的第一层放有4本不同的科技书，第二层放有3本不同的漫画书，第三层放有2本不同的文学书，从书架的第一、二、三层各取1本书，有多少种不同的取法．
<gadget id="calculator">4 * 3 * 2</gadget>
<output>24</output>

<result>24</result>