There are 2 ways to go from A to B, and 4 ways to go 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2条路可走，从乙地到丙地有4条路可走，那么从甲地经过乙地到丙地共有多少种不同的走法．
<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<result>8</result>