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雷达卡
题目如下，恳求论坛的牛人们伸出援手相助，感激不尽：
A stock index currently stands at 300 and has a volatility of 20%. The risk-free rate is 8% and the dividend yield on the index is 3%. Use a 3-step binomial tree to value a 6-month put option on the index with a strike price of 300 if it is 1) European 2) American?
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