Fang Fang tossed a coin 4 times, and in the first 3 times, she landed heads once and tails twice. What is the probability of tails on the fourth toss?
芳芳抛硬币4次，前3次中一次正面朝上，两次反面朝上．那么第四次抛，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>