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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? - 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?
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APPEARS IN

 Selina Solution for Concise Mathematics for Class 10 ICSE (2020 (Latest))
Chapter 25: Probability
Exercise 25(C) | Q: 23.2 | Page no. 395
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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? Concept: Probability - A Theoretical Approach.
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