Question

A lot consists of 144 ball pens of which 20 are defective and the others are good.Rafia 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. The probability that she will buy that pen is

• A. $\frac{5}{36}$
• B. $\frac{20}{36}$
• C. $\frac{31}{36}$
• D. $\frac{31}{144}$

Answer 1

Answer: (C)

$\frac{31}{36}$

Answer 2

The correct option is (C): $\frac{31}{36}$