1.

The arithmetic mean of 1, 8, 27, 64, … up to n terms is given by

A. \(\frac{{{\rm{n}}\left( {{\rm{n}} + 1} \right)}}{2}\)
B. \(\frac{{{\rm{n}}{{\left( {{\rm{n}} + 1} \right)}^2}}}{2}\)
C. \(\frac{{{\rm{n}}{{\left( {{\rm{n}} + 1} \right)}^2}}}{4}\)
D. \(\frac{{{{\rm{n}}^2}{{\left( {{\rm{n}} + 1} \right)}^2}}}{4}\)
Answer» D. \(\frac{{{{\rm{n}}^2}{{\left( {{\rm{n}} + 1} \right)}^2}}}{4}\)


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