There are 3 different story books and 4 different science and technology books on the bookshelf. If you choose a book from them, how many different ways are there in total?
书架上共有3本不同的故事书，4本不同的科技书，从中任取一本书，一共有多少种不同的取法．
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<result>12</result>