Using 5, 6, and 7 to form a three-digit number, what is the probability that the formed number is a common multiple of 3 and 5?
用5，6，7三个数组成一个三位数，组成的数是3，5的公倍数的可能性是多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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