Taking any two numbers from 3, 4, 5, and 6 each time, one as the numerator and the other as the denominator, many different fractions can be formed. What is the possibility of being the simplest true fraction?
每次从3，4，5，6中任取两个数，一个作分子，一个作分母，可以组成很多不同的分数，其中是最简真分数的可能性是多少．
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">4 * (3/2) * 2</gadget>
<output>12</output>

<gadget id="calculator">4 / 12</gadget>
<output>1/3 = around 0.333333</output>

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