[機統] 銅板問題
You start with one dollar.A fair coin is tossed 25 times.
Each time the coin comes up head,your fortune doubles.
Each time the coin comes up tails,your fortune is reduced by one half.
Let X be your fortune after all 25 tosses.
find P(X=2)=?
參考答案是C(25,13)*(1/2)^13*(1/2)^12
感覺類似binomial
可是不太清楚為什麼..
先謝謝各位了!
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05/09 06:54, , 1F
05/09 06:54, 1F
→
05/09 07:32, , 2F
05/09 07:32, 2F
推
05/09 08:37, , 3F
05/09 08:37, 3F
推
05/09 16:57, , 4F
05/09 16:57, 4F
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05/09 16:58, , 5F
05/09 16:58, 5F
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05/09 16:59, , 6F
05/09 16:59, 6F
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05/09 17:00, , 7F
05/09 17:00, 7F
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05/09 17:01, , 8F
05/09 17:01, 8F
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05/10 21:11, , 9F
05/10 21:11, 9F
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