這道概率題誰會？想了好久也沒辦法

來源: 於 2025-01-04 14:45:00 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

A fair coin is tossed repeatedly until either heads comes up three times in a row or tails comes up three times in a row. What is the probability that the coin will be tossed more than $10$ times? Express your answer as a common fraction. 

有沒有通俗易懂的辦法？