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A purse contains 4 silver and 5 copper coins. A second purse contains 3 silver and 7 copper coins.

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A purse contains 4 silver and 5 copper coins. A second purse contains 3 silver and 7 copper coins. If a coin is taken out at random from one of the purses, what is the probability that it is a copper coin?

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Let E1 = selecting the first purse, E2 selecting the second purse and A = coin drawn is silver.

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