There are 4 different roads from A to B, and 3 different roads from B to C, so how many different ways are there to go from A to B to C?
从甲地到乙地有4条不同的道路，从乙地到丙地有3条不同的道路，那么从甲地经乙地到丙地共有多少种不同的走法．
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<result>12</result>