Question

the incidence rate of diabetes increases but mortality remains stable, which of the following is most likely
prevalence will increase
prevalence will decrease
prevalence will remain unchanged
there is not enough information to predict

Explanation:

Prevalence is calculated as Incidence × Duration. If incidence increases and mortality (which affects duration as it reduces the number of existing cases) remains stable (so duration doesn't decrease due to mortality), prevalence will increase.

Answer:

Prevalence will increase