The gold coin

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A box has two drawers. Drawer number 1 contains four gold coins and two silver coins.
Drawer number 2 contains three gold coins and three silver coins. A drawer is opened at
random and a coin selected at random from the open drawer. Compute the probability of each
of the following events:
a. Drawer number 2 was opened and a silver coin was selected.
b. A gold coin was selected from the opened drawer.

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