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Mathematics 10 Online
OpenStudy (anonymous):

In an election for the president of the student council, it is estimated that Anne has a 40 percent chance of winning, Tanya has a 30 percent chance, Graham has a 20 percent chance, and Maria has a 10 percent chance. Just before the election, Graham withdraws. Now, what are the chances of winning for Anne, Tanya, and Maria? Hint: being withdrawn from the election is equivalent to knowing that he does not win the election.

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