There are 2 paths from point A to point B, and 4 paths from point B to point C. How many paths are there from point A to point C via point B?
从A地到B地有2条路可走，从B地到C地有4条路可走，那么从A地经B地到C地共有多少条路可走．
<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<result>8</result>