A coin is tossed 3 times and it lands heads 1 time and tails 2 times, what is the probability of tails on the 4th toss?
掷3次硬币，有一次正面朝上，有2次反面朝下，那么，掷第4次硬币反面朝上的可能性是多少
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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