Advertisement Remove all ads

A Lot Consists of 144 Ball Pens of Which 20 Are Defective and the Others Are Good. Nuri Will Buy a Pen If It is Good, but Will Not Buy If It is Defective. the Shopkeeper Draws One Pen at Random and Gives It to Her. What is the Probability That She Will Not Buy It? - Mathematics

Advertisement Remove all ads
Advertisement Remove all ads
Advertisement Remove all ads

A lot consists of 144 ball pens of which 20 are defective and the others are good. Nuri will buy a pen if it is good, but will not buy if it is defective. The shopkeeper draws one pen at random and gives it to her. What is the probability that She will not buy it?

Advertisement Remove all ads


Total number of pens = 144

Total number of defective pens = 20

Total number of good pens = 144 − 20 = 124

P (she will not buy a pen)  = 1 - 31/36 = 5/36

Concept: Probability - A Theoretical Approach
  Is there an error in this question or solution?


NCERT Class 10 Maths
Chapter 15 Probability
Exercise 15.1 | Q 21.2 | Page 310
RD Sharma Class 10 Maths
Chapter 16 Probability
Exercise 16.1 | Q 35.2 | Page 23
Advertisement Remove all ads

View all notifications

      Forgot password?
View in app×