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Differential Equations in Biology

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Multiple Choice

Which of the following differential equations models exponential population growth?

  1. $$\frac{dN}{dt} = rN$$
  2. $$\frac{dN}{dt} = rN(1 - \frac{N}{K})$$
  3. $$\frac{dN}{dt} = rN^2$$
  4. $$\frac{dN}{dt} = rN(N - K)$$
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