| 摘要 |
PURPOSE: An optional lottery is provided to choose the ratio of winning numbers and the time of determining a lot. In addition, moving picture can show directly the result of a lot. CONSTITUTION: In the optional lottery, The ratio of winning numbers and the time of determining a lot can be chosen. For example, if five persons bet individually10 dollars on a lottery, the probability of prize winning is one-fifth and the winning prize is 50 dollars. The time of determining a lot can be chosen freely.
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