If someone tosses a coin and it lands heads three times in a row, what is the probability that he will get heads on the fourth toss?
某人掷一枚硬币，结果是连续3次都是正面朝上，那么他第4次掷硬币时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>