SPS SPS FM Pure 2022 June — Question 9

Exam BoardSPS
ModuleSPS FM Pure (SPS FM Pure)
Year2022
SessionJune
TopicProof by induction
9. Prove by induction that for \(n \in \mathbb { Z } ^ { + }\) $$\mathrm { f } ( n ) = 4 ^ { n + 1 } + 5 ^ { 2 n - 1 }$$ is divisible by 21
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