If a coin is tossed 3 times and it lands heads twice, and the other time, what is the probability that it will land heads the fourth time?
1枚硬币掷3次有两次正面朝上，1次反而朝上，那么第四次正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>