How many three-digit even numbers without repeating numbers can be formed from the numbers 0, 1, 2, 3, and 4.
由数字0，1，2，3，4可以组成多少个没有重复数字的三位偶数．
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">12 + 9 + 9</gadget>
<output>30</output>

<result>30</result>