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.


Total number of pens = 12 + 132 = 144

Total number of good pens = 132


Probability of getting a good pen =


=


=


16
1