Using the six numbers 0, 1, 2, 3, 4, 5, how many three-digit numbers can be formed without repeating numbers.
用0、1、2、3、4、5六个数字，能组成多少个没有重复数字的三位数．
<gadget id="calculator">5 * 5 * 4</gadget>
<output>100</output>

<result>100</result>