Xiao Ming called his aunt's house and forgot one of the numbers. He only remembered that the number was seven digits: 758706□.
小明给姑姑家打电话忘记了其中一个号码，只记得号码是七位：758706□，如果小明随意拨打，恰好拨对的可能性是多少．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>