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If a subscript K equals fraction numerator 1 over denominator K left parenthesis K plus 1 right parenthesis end fractionfor K equals 1 comma 2 comma 3 horizontal ellipsis.. n  then open parentheses sum from K equals 1 to n of   a subscript K close parentheses squared equals

  1.  fraction numerator n over denominator n plus 1 end fraction  
  2. fraction numerator n squared over denominator left parenthesis n plus 1 right parenthesis squared end fraction    
  3. fraction numerator n to the power of 4 over denominator left parenthesis n plus 1 right parenthesis to the power of 4 end fraction    
  4. fraction numerator n to the power of 6 over denominator left parenthesis n plus 1 right parenthesis to the power of 6 end fraction    

The correct answer is: fraction numerator n squared over denominator left parenthesis n plus 1 right parenthesis squared end fraction


    Because of the greater size of Br, Br exert greater repulsive force. Hence Br in the equitorial position add maximum stability.

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