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What is the closed formula for the sum of terms of an arithmetic progression?

What is the closed formula for the sum of terms of an arithmetic progression?
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What is the closed formula for the sum of terms of an arithmetic progression?

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User Basil Abubaker
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Answer:


\[ S = (n)/(2) * (2a_1 + (n - 1)d) \]

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User Vimuth
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