hard · GMAT Quant
A signal processing module calculates a total operational gain given by S_N = sum_k=1^N dfrac3(3k-2)(3k+1).
Which of the following expresses S_N in terms of N?
- dfracN3N+1
- dfrac3N-13N+1
- dfrac3N3N+1
- dfrac3N+13N
- dfrac13N+1
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