On 100 cards, number 1 to 100 without repetition. At least how many cards must be drawn at random to ensure that the product of the numbers on the drawn cards can be divisible by 12.
在100张卡片上不重复地编上1～100，至少要随意抽出多少张卡片时，才能保证所抽出的卡片上数的乘积可被12整除．
<gadget id="calculator">100 - 33</gadget>
<output>67</output>

<gadget id="calculator">67 + 1</gadget>
<output>68</output>

<result>68</result>