There are 3 different ways to go from A to B, and 4 different ways to go from B to C. The small army must pass B from A to C. How many different ways does he have?
甲地地乙地有不同的3条路可走，乙地到丙地有不同的4条路可走，小军从甲地到丙地必经过乙，他有多少种不同的走法．
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<result>12</result>