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Question
4 defective pens are accidentally mixed with 16 good ones. It is not possible to just look at a pen and tell whether or not it is defective. One pen is drawn at random from the lot. What is the probability that the pen is defective?
Sum
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Solution
Total number of pens = 4 + 16 = 20
Total possible outcomes = 20
Number of defective pens = 4
P(defective pen) = `4/20 = 1/5`
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Chapter 25: Probability - TEST YOURSELF [Page 409]
