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Question

I f space r subscript 1 equals 8 comma r subscript 2 equals 12 comma r subscript 3 equals 24 comma then Cequals

  1. fraction numerator pi over denominator 4 end fraction    
  2. fraction numerator pi over denominator 6 end fraction    
  3. fraction numerator pi over denominator 3 end fraction    
  4. fraction numerator pi over denominator 2 end fraction    

The correct answer is: fraction numerator pi over denominator 2 end fraction


    . fraction numerator 1 over denominator r end fraction equals fraction numerator 1 over denominator r subscript 1 end subscript end fraction plus fraction numerator 1 over denominator r subscript 2 end subscript end fraction plus fraction numerator 1 over denominator r subscript 3 end subscript end fraction

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