MathematicsMedium178×since 2002Q5302The sum 1+13+231+2+13+23+331+2+3+......+13+23+33+...+1531+2+3+...+151 + {{{1^3} + {2^3}} \over {1 + 2}} + {{{1^3} + {2^3} + {3^3}} \over {1 + 2 + 3}} + ...... + {{{1^3} + {2^3} + {3^3} + ... + {{15}^3}} \over {1 + 2 + 3 + ... + 15}}1+1+213+23+1+2+313+23+33+......+1+2+3+...+1513+23+33+...+153−12(1+2+3+...+15)- {1 \over 2}\left( {1 + 2 + 3 + ... + 15} \right)−21(1+2+3+...+15) is equal to :A620B1240C1860D660Check answerSkip