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  1. mu over 2 open parentheses 7 F subscript 1 minus 3 F subscript 2 close parentheses
  2. mu over 2 open parentheses 5 F subscript 1 minus 3 F subscript 2 close parentheses
  3. mu open parentheses 3 F subscript 1 minus F subscript 2 close parentheses
  4. mu over 2 open parentheses 3 F subscript 1 minus F subscript 2 close parentheses

The correct answer is: mu over 2 open parentheses 7 F subscript 1 minus 3 F subscript 2 close parentheses


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