poker cards, namely 3, 4, 5, 6, 7, with their backs facing up, what is the probability of randomly drawing a card that is a multiple of 2?
5张扑克牌，分别是3、4、5、6、7，背面朝上，任意抽出一张是2的倍数的可能性是多少．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>