The process of forecasting voting outcomes is complex by combinatory.But it is intuitive and simple by geometry instead of combinatory to compute probabilities of kinds of voting outcomes.

• 摘要用排列组合来计算对投票结果的预测，过程较复杂，而采用几何法代替组合学方法，计算各种投票结果出现的概率，方法简单直观。