# 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 is defective. One pen is taken out at random from this lot. Determine the probability that the pen taken out is a good one.

Given,

Total defective pens = 12

Total good pens = 132

number of favourable cases = 132

Total number of pens = 12 + 132

Total number of pens = 144

Number of total outcomes will 144.

Probability that the pen taken out is a good one =

P(pen taken out is good one) =

P(pen taken out is good one) =

Probability of pen taken out is good one is

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