If there are 4 routes from A to B and 2 routes from B to C, how many different routes are there from A to C?
从A地到B地有4条路线可以走，从B地到C地有2条路线可以走，那么从A地到C地有多少条不同的路线可以走．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<result>8</result>