If a coin is tossed 9 times in a row and it comes up heads, what is the probability that it will come up tails on the 10th toss?
抛一枚硬币，连续9次都是正面朝上，第10次抛出，反面朝上的可能性为多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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