A lot consists of 144 ball pens of which 20 are defective and the others are good Nuri will buy a pe...

Question

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

Accepted Answer

The total numbers of outcomes ie pens 144 Given numbers of defective pens 20 The numbers of non defective pens 14420 124 PE Number of favourable outcomes Total number of outcomes Total numbers events in which she will not buy them 20 So P not buying 20144 536

NCERT Solutions Class 10 Mathematics Solutions for Probability - Exercise 15.1 in Chapter 15 - Probability