3. There are 30 laptops available in the stock when 3 of them have battery problem and considered to be defective (D) and the rest are good (G). Five laptops are randomly collected from the stock (without replacement). a) What is the probability of having exactly 1 defective in the group of 5 laptops, P(4G N 1D)? b) What is the probability of collecting at least 4 good laptops in the group of 5, P(G > 4)?

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