Q:

The incidence of pollen allergy at Wah Cantt is 10 cases per thousand populations. The mean duration of illness is 3 months from February to April. The prevalence of pollen allergy at Wah Cantt is:

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The incidence of pollen allergy at Wah Cantt is 10 cases per thousand populations. The mean duration of illness is 3 months from February to April. The prevalence of pollen allergy at Wah Cantt is:


  1. 10
  2. 20
  3. 30
  4. 40
  5. 50

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c) 30

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