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Mathematics 12 Online
OpenStudy (anonymous):

A pirate's treasure chest is recovered. Everyone of the crew members is promised one item from the chest chosen randomly by the first mate. In the chest are 6 rubies, 27 diamonds, 2 sapphires, 12 strands of pearls, 42 silver coins, and 7 gold coins. What is the probability that Angelica, one of the crew members, will get a gemstone (a ruby, a sapphire, or a diamond)?

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