帮忙转 金融工程 版# WaterWorld - 未名水世界
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第一次注册了账号，还不能在其他版面发言
心血来潮，用纳什均衡算了一下，答案应该是：
deck composition：
1 60/137
2 30/137
3 20/137
4 15/137
5 12/137
expected value：
60/137
发信人: hkzhang (Aaron), 信区: Quant
标 题: 问个面试题
发信站: BBS 未名空间站 (Wed Nov 20 10:38:16 2013, 美东)
There are infinite cards numbered 1-5. You construct a deck. Someone guesses
a value and draws a card. If they guessed correctly, they get the value.
What composition of the deck minimizes their expected value？
题目没看懂， 一个deck是5张还是不限张数还是infinite的全部。5张的话是随便取五
张还是要一到五俱全？
要是把题目改为： here are five cards numbered 1-5. You construct a deck.
Someone guesses a value and draws a card. If they guessed correctly, they
get the value. What composition of the deck minimizes their expected value？
就简单了。
心血来潮，用纳什均衡算了一下，答案应该是：
deck composition：
1 60/137
2 30/137
3 20/137
4 15/137
5 12/137
expected value：
60/137
发信人: hkzhang (Aaron), 信区: Quant
标 题: 问个面试题
发信站: BBS 未名空间站 (Wed Nov 20 10:38:16 2013, 美东)
There are infinite cards numbered 1-5. You construct a deck. Someone guesses
a value and draws a card. If they guessed correctly, they get the value.
What composition of the deck minimizes their expected value？
题目没看懂， 一个deck是5张还是不限张数还是infinite的全部。5张的话是随便取五
张还是要一到五俱全？
要是把题目改为： here are five cards numbered 1-5. You construct a deck.
Someone guesses a value and draws a card. If they guessed correctly, they
get the value. What composition of the deck minimizes their expected value？
就简单了。