The six faces of a cube are marked with: 1, 2, 3, 4, 5, 6 respectively. If the cube is thrown up arbitrarily, what is the probability that the prime numbers will face up after landing?
一个正方体六个面分别标着：1、2、3、4、5、6，把这个正方体任意上抛，落地后，素数朝上的可能性是多少
<gadget id="calculator">3 / 6</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>