| 原文是： |
| 送交者: gugeren 2019月05月01日16:10:51 於 [靈機一動] 發送悄悄話 |
| 回 答: 趣味的數學-58 由 gugeren 於 2019-04-29 17:24:06 |
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2】Successive Wins To encourage Elmer's promising tennis career, his father offers him a prize if he wins (at least) 2 tennis sets in a row in a 3-set series to be played with his father and the club champion alternately: |
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