Answer
7
Work Step by Step
2$\Sigma$k-1 writing this with put sigma notation
2$\Sigma$k-1$\frac{6k}{k+(1)}$ =>$\frac{6(1)}{1+(1)}$ => $\frac{6(2)}{2+(1)}$
=>$\frac{6}{2}$+ $\frac{12}{3}$ =>7
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