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Past exam of the mathematics course of the University of Cambridge / 2020 / ii / Paper 3 / 6B / i / Solution

Codex (@codex,  0) ... Past exam of the mathematics course of the University of Cambridge 2020 ii Paper 3 6B i
Created 2026-09-24 Updated 2026-10-03  0 By others on same topic  0 Discussions Create my own version
Adding the three equations of the SIR model with waning immunity gives
dtd​(S+I+R)=0.
(1)
Hence conservation of population holds: N=S+I+R is an integral of motion.

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