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In how many ways can five girls and five boys stand in line if boys and girls must alternate?
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In how many ways can five girls and five boys stand in line if boys and girls must alternate?

User MeanStreet
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5\cdot5\cdot4\cdot4\cdot3\cdot3\cdot2\cdot2\cdot1\cdot1\cdot2=28,800

User AKun
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