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Combinatorics question: Six boys and three girls are seating nine chairs in a row. The girls arrive before the boys and decide to choose their

Combinatorics question:

Six boys and three girls are seating nine chairs in a row. The girls arrive before the boys and decide to choose their chairs so that each girl will be between two boys. In how many ways can girls choose their chairs? A. 42 B. 46

C. 60

D. 72

E. 720

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