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(Solved): Write the given expression using summation notation. \[ \begin{array}{l} \quad\left(1^{3}-7\right)- ...
Write the given expression using summation notation. \[ \begin{array}{l} \quad\left(1^{3}-7\right)-\left(2^{3}-7\right)+\left(3^{3}-7\right)-\left(4^{3}-7\right)+\left(5^{3}-7\right) \\ \sum_{k=1}= \\ k= \end{array} \]