Lemma
MediumCounting & chance
OpenStax, Algebra and Trigonometry 2e §13.7 Probability · Review Exercise 85 · Probability · Counting & chance

Probability · Review Exercise 85

Use the formula for the sum of the first terms of an arithmetic series to find the sum of the first eleven terms of the arithmetic series 2.5, 4, 5.5, ….

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OpenStax, Algebra and Trigonometry 2e · §13.7 Probability · Review Exercise 85

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Checked against the answer in OpenStax, Algebra and Trigonometry 2e.