There are 2 roads from A to B, and 3 roads from B to C, so how many ways are there to go from A to C?
从甲地到乙地有2条路，从乙地到丙地有三条路，那么从甲地到丙地共有多少种走法．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<result>6</result>