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Mathematics 13 Online
OpenStudy (anonymous):

Suppose there are three caskets. Casket 1 contains 2 gold coins, Casket 2 contains 1 gold and 1 silver coin, and Casket 3 contains 2 silver coins. Suppose you choose one casket at random and draw a coin. If the coin is gold, the probability that the second coin in the casket is gold can be written as ab, where a and b are coprime positive integers. What is the value of a+b?

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