Put 6 identical small balls marked with numbers 12, 27, 37, 43, 49, and 57 in a box, stir them thoroughly, touch any ball from it, and touch the possibility of the ball marked with a prime number how many
将分别标有数12、27、37、43、49、57的6个同样的小球放在一个盒子里，充分搅匀后，从中任意摸1个球，摸到标有素数的球的可能性是多少
<gadget id="calculator">2 / 6</gadget>
<output>1/3 = around 0.333333</output>

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