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math..word problem

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Tom and Fred are inseparable twins. They are in a five-person club. How many ways can these five line up for a photo if Tom and Fred must stand together?

  • math..word problem -

    treat Tom and Fred as one unit, so there are only 4 to arrange
    That would be 4!
    But within each those, Tom and Fred could be switched.
    So the total number of ways is 2(4!) = 48

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