NCERT Solutions
Class 10 - Mathematics - Chapter 14: PROBABILITY - Exercise 14.1Question 21
Class 10 - Mathematics - Chapter 14: PROBABILITY - Exercise 14.1
Question. 21
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 it if it is defective. The shopkeeper draws one pen at random and gives it to her. What is the probability that:
(i) she will buy it?
(ii) she will not buy it?
Answer:
(i) \(\dfrac{31}{36}\)
(ii) \(\dfrac{5}{36}\)