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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? - Mathematics

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?  

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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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Selina Concise Maths Class 10 ICSE
Chapter 25 Probability
Exercise 25 (C) | Q 23.1 | Page 395
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