Question

2. 12 defective pens are accidentally mixed with 132 good ones. It is
not possible to just look at a pen and tell whether or not it is defective.
One pen is taken out at random from this lot. Determine the probability
that the pen taken out is a good one
​

Answer 1

Explanation:

total no. of pens = 132+12

= 144

probability of getting a good pen is = 132÷144