What is the probability that Xiao Ming flips the coin 3 times and it comes up heads?
小明抛3次硬币都正面朝上，第四次抛硬币正面朝上的可能性是多少
<gadget id="calculator">1 + 1</gadget>
<output>2</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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