Expectation of the largest bet size in the Labouchere system

[摘要] For the Labouchere system with winning probability $p$ at each coup, we prove that the expectation of the largest bet size under any initial list is finite if $p>\frac{1} {2}$, and is infinite if $p\le \frac{1} {2}$, solving the open conjecture in [6]. The same result holds for a general family of betting systems, and the proof builds upon a recursive representation of the optimal betting system in the larger family.

[学科分类] 统计和概率

[关键词] Labouchere system;gambling theory;martingale;combinatorics