23/27

来源: 于 2026-01-13 11:48:11 [旧帖] [给我悄悄话] 本文已被阅读：次

First round: 2/3

Second round: 2/3 + (1/3)*(1/3) = 7/9

Third round: 7/9 + (2/9)*(1/3) = 23/27.