What would the population of mice be after 20 years if you start with 30 and your number increases by a factor of 3 every 5 years?

What would the population of mice be after 20 years if you start with 30 and your number increases by a factor of 3 every 5 years?
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Answer :

population = 30 × 3^(20÷5) = 30 × 3⁴ = 2430
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