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The number of people with a disease within the community increases when Incidence rate < death...

The number of people with a disease within the community increases when

  1. Incidence rate < death rate + cure rate
  2. Incidence rate < prevalence rate < death rate + cure rate
  3. Prevalence rate = death rate + cure rate
  4. Incidence rate > death rate + cure rate

and explain please

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