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Alex, his mother, his father, and his older sister have blood type B. His younger sister...

Alex, his mother, his father, and his older sister have blood type B. His younger sister and his brothers have type O. Anna, her mother, her father, and her younger brother have type A. Her sister and her older brother have type O. If Alex and Anna have three children, what is the probability at least two of them will have type O? Show your work and circle your answer.

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