Question 0502c

Sigma Notation
Top Limit Handling

Question

It is given that
r=1nur=2n8.\sum_{r=1}^n u_r = 2 n - 8.
Find an expression for r=13nur.{\displaystyle \sum_{r=1}^{3 n} u_r.}

Attempt

r=13nur={\displaystyle \sum_{r=1}^{3 n} u_r =}

Answer

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