OCR C2 2011 January — Question 5

Exam BoardOCR
ModuleC2 (Core Mathematics 2)
Year2011
SessionJanuary
TopicGeometric Sequences and Series
5 In a geometric progression, the sum to infinity is four times the first term.
  1. Show that the common ratio is \(\frac { 3 } { 4 }\).
  2. Given that the third term is 9 , find the first term.
  3. Find the sum of the first twenty terms.
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