PLEASE HELP Which expression defines the arithmetic series 1 + 5 + 9 + ... for seven terms?
Σ(27-1)
Σ(3n-4)
Σ(4n-3)
Σ(n-1)

Step-by-step explanation:

Given

Required

Write a definition

First, we derive a formula for the series using:

From the attached data;

So:

Collect like terms

So, the definition for first 7 terms is:

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step-by-step explanation:

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step-by-step explanation:

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