The answer should be 1/2.
The question is：如果我只從袋中隨機抽出一個錢幣，且我看到的一面是金色，那麼這錢幣的背面是銀色的概率為多少？
It is given that a coin is drawn out,and given that the coin has a golden coloured side~
As the one explained above,why it's 1/3?
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