OCR MEI FP1 2007 June — Question 7

Exam BoardOCR MEI
ModuleFP1 (Further Pure Mathematics 1)
Year2007
SessionJune
TopicProof by induction
7 Prove by induction that \(\sum _ { r = 1 } ^ { n } 3 ^ { r - 1 } = \frac { 3 ^ { n } - 1 } { 2 }\).
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