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  1. fraction numerator n plus 1 over denominator 3 end fraction
  2. fraction numerator 2 n plus 1 over denominator 3 end fraction
  3. n plus 1
  4. 2 n plus 1

The correct answer is: fraction numerator 2 n plus 1 over denominator 3 end fraction


    fraction numerator 2 n plus 1 over denominator 3 end fraction

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