C. Two Consecutive Sums
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C. Two Consecutive Sums
For an arithmetic series, what would need to be added to \(S_{n - 1} \) to give \(S_n \)? If the last term in the series is \(t_n \), then by adding \(t_n \) to \(S_{n - 1} \), the result is \(S_n \).
\(S_{n - 1} + t_n = S_n \)
Rewritten, you arrive at an important formula.
\(S_{n - 1} + t_n = S_n \)
Rewritten, you arrive at an important formula.
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