How many different three-digit numbers can be formed using the three numbers 3, 4, and 5? (Numbers are not reused)
用3、4、5三个数字可以组成多少个不同的三位数．(数字不重复使用)
<gadget id="calculator">3 * 2 * 1</gadget>
<output>6</output>

<result>6</result>