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Posted by on Friday, July 17, 2009 at 6:35am.

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 - , Friday, July 17, 2009 at 7:29am

    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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