The six numbers of 1, 2, 3, 4, 5, and 6 are written on the six faces of a cube. If the cube is thrown upwards at will, what is the probability that the number facing up after falling is a prime number?
一个正方体六个面上分别写着1、2、3、4、5、6这六个数，把这个正方体任意往上抛，落下后朝上的数是素数的可能性是多少
<gadget id="calculator">3 / 6</gadget>
<output>1/2 = around 0.5</output>

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