How many five-digit even numbers without repeating numbers can be formed by using 0, 2, 4, 7, and 9.
用0，2，4，7，9可组成多少个没重复数字的五位偶数．
<gadget id="calculator">4 * 3 * 2 * 1</gadget>
<output>24</output>

<gadget id="calculator">3 * 3 * 2 * 1</gadget>
<output>18</output>

<gadget id="calculator">24 + 18 + 18</gadget>
<output>60</output>

<result>60</result>