Edexcel C1 — Question 3

Exam BoardEdexcel
ModuleC1 (Core Mathematics 1)
TopicArithmetic Sequences and Series
  1. A sequence is defined by the recurrence relation
$$u _ { n + 1 } = u _ { n } - 2 , \quad n > 0 , \quad u _ { 1 } = 50 .$$
  1. Write down the first four terms of the sequence.
  2. Evaluate $$\sum _ { r = 1 } ^ { 20 } u _ { r } .$$
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