Find The Pattern - 4

13=123=3+533=7+9+1143=13+15+17+1953=21+23+25+27+2963=31+33+35+37+39+4173=43+45+47+49+51+53+55 \begin{array} { c c l } 1 ^ 3 & = &1 \\ 2^3 & = & 3 + 5 \\ 3^3 & = & 7 + 9 + 11 \\ 4^3 & = & 13 + 15 + 17 + 19 \\ 5^3 & = & 21 + 23 + 25 + 27 + 29 \\ 6^3 & = & 31 + 33 + 35 + 37 + 39 + 41 \\ 7^3 & = & 43 + 45 + 47 + 49 + 51 + 53 + 55 \\ \end{array}

What is the value of:

73+75+77+79+81+83+85+87+89? 73 + 75 + 77 + 79 + 81 + 83 + 85 +87 +89 ?

Note: Can you explain what is happening?

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