根據以上分析,要在剛超過1/2的時候停止,隻能是在奇數次停止,而且最後一次是正麵,前麵正反相等。
1/2 + 2/3 * C_2^1 (1/2)^3 + 3/5 C_4^2 (1/2)^5 + ....
= \sum_{n=0}^\infty (n+1)/(2n+1) C_{2n}^n (1/2)^(2n+1)
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