There are 3 cards, which are 2, 6, and 9. If you choose any 2 cards to form a two-digit number, what is the probability that it is an even number?
有3张卡片，分别是2、6、9，任意选2张组成一个两位数，是偶数的可能性是多少．
<gadget id="calculator">4 / 6</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>