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1.2.3+2.3.4+3.4.5+........n terms

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  1. fraction numerator n left parenthesis n plus 1 right parenthesis left parenthesis n plus 2 right parenthesis left parenthesis 3 n plus 5 right parenthesis over denominator 2 end fraction    
  2. fraction numerator n left parenthesis n plus 1 right parenthesis left parenthesis n plus 2 right parenthesis left parenthesis n plus 3 right parenthesis over denominator 4 end fraction    
  3. 2n(n + 1)(n + 2)
  4. fraction numerator n left parenthesis n plus 1 right parenthesis left parenthesis n plus 2 right parenthesis left parenthesis 3 n plus 1 right parenthesis over denominator 12 end fraction    

    Answer:The correct answer is: fraction numerator n left parenthesis n plus 1 right parenthesis left parenthesis n plus 2 right parenthesis left parenthesis n plus 3 right parenthesis over denominator 4 end fraction

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