A troupe of 10 dancers is going to line up on stage. Of these dancers, 5...

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A troupe of 10 dancers is going to line up on stage. Of these dancers, 5 are wearing blue and 5 are wearing white. A dancer wearing blue must be in the first position and they must alternate between colors. In how many ways can the dancers line up? A troupe of 10 dancers is going to line up on stage. Of these dancers, 5 are wearing blue and 5 are wearing white. A dancer wearing blue must be in the first position and they must alternate between colors. In how many ways can the dancers line up?