There are 5 labels corresponding to 5 medicine bottles, how many possible cases are there that exactly 3 labels are mislabeled?
有5个标签分别对应着5个药瓶，恰好贴错3个标签的可能情况共有多少种？
<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<result>20</result>