Exactly 4 enhanced: $inom{9}{4} = 126$.
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- Total ways to choose 4 plants: $inom{12}{4} = 495$.
- Favorable cases:
- Exactly 3 enhanced, 1 not: $inom{9}{3} \cdot inom{3}{1} = 84 \cdot 3 = 252$.
- Total favorable: $252 + 126 = 378$.
- Probability: $ rac{378}{495} = rac{126}{165} = rac{42}{55}$.
- Thus, the probability is $oxed{\dfrac{42}{55}}$.Question: A bioinformatician models the expression level of a gene as a function $ E(t) = rac{t^2 + 4t + 3}{t + 1} $, where $ t $ represents time in hours after treatment. Simplify $ E(t) $ and determine $ \lim_{t o -1} E(t) $, if it exists.
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