How many three-digit numbers can be formed from the number cards 1, 2, 3, 4, 5, and 6? How many
由数字卡片1、2、3、4、5、6可组成多少个三位数？多少
<gadget id="calculator">6 * 5 * 4</gadget>
<output>120</output>

<result>120</result>