There are three cards with 3, 5, and 6 written on them respectively. If these three cards are used to form a three-digit number, what is the probability that the three-digit number is even (fill in the fraction).
有三张卡片上分别写着3，5，6．如果用这三张卡片摆出一个三位数，则摆出的三位数是偶数的可能性是多少(填几分之几)．
<gadget id="calculator">2 / 6</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>