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Suppose the Pen Drawn in (I) is Defective and is Not Replaced. Now One More Pen is Drawn at Random from the Rest. What is the Probability that this Pen Is: A) Defective B) Not Defective? - ICSE Class 10 - Mathematics

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Question

 Suppose the pen drawn in (i) is defective and is not replaced. Now one more pen is drawn at random from the rest. What is the probability that this pen is:
a) defective
b) not defective?

Solution

If defective pen drawn in first draw is not reeplaced, total possible outcomes= 20-1=19 

a) Number of defctive pens=3 

p(defective pens)=`3/19` 

b) Number of not defective pens=16 

p(not defective pens) =`16/19`

  Is there an error in this question or solution?
Solution Suppose the Pen Drawn in (I) is Defective and is Not Replaced. Now One More Pen is Drawn at Random from the Rest. What is the Probability that this Pen Is: A) Defective B) Not Defective? Concept: Probability - A Theoretical Approach.
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