Edexcel C1 — Question 2

Exam BoardEdexcel
ModuleC1 (Core Mathematics 1)
TopicArithmetic Sequences and Series
2. The sum of an arithmetic series is $$\sum _ { r = 1 } ^ { n } ( 80 - 3 r ) .$$
  1. Write down the first two terms of the series.
  2. Find the common difference of the series. Given that \(n = 50\),
  3. find the sum of the series.
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