Xiaolan called her grandmother's house, but forgot a number, only remembering that it was 77☆4586, she dialed at will, what is the possibility of getting through exactly.
小兰给外婆家打电话，忘记了一个号码，只记得是77☆4586，她随意拨打，恰好拨通的可能性是多少．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

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