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To get a full mark, please show all your work in the solutions. 1) There are 4 golden coins and 8 iron coins in a

To get a full mark, please show all your work in the solutions. 1) There are 4 golden coins and 8 iron coins in a bag. You select one coin from the bag, if it is a golden coin, you keep it; but if it is an iron coin, you put it back in the bag. Find the probability of earning exactly 2 golden coins after: a) Two consecutive selections b) Three consecutive selections

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