Edexcel C1 2014 January — Question 5

Exam BoardEdexcel
ModuleC1 (Core Mathematics 1)
Year2014
SessionJanuary
TopicArithmetic Sequences and Series
5. Given that for all positive integers \(n\), $$\sum _ { r = 1 } ^ { n } a _ { r } = 12 + 4 n ^ { 2 }$$
  1. find the value of \(\sum _ { r = 1 } ^ { 5 } a _ { r }\)
  2. Find the value of \(a _ { 6 }\)
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