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Arithmetic Series Sum

Sum Sₙ = n/2 × (a₁ + aₙ) of an arithmetic series.

Series parameters
29
Last term (aₙ)
155
Sum (Sₙ)
15.5
Average

S = n × (a₁ + aₙ) / 2 = 10 × (2 + 29) / 2

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