12 defective pens are accidently mixed with 132 good ones. It is not possible to just look at pen and tell whetehr or not it is defective. One of them is taken out at random from this lot. Find the probability that the pen taken out taken out is good one.

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Solution

total outcomes = 132 + 12 = 144
total favourable outcomes = 132
Probability= $\frac{132}{144}$ = $\frac{11}{12}$

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12 defective pens are accidently mixed with 132 good ones. It is not possible to just look at pen and tell whetehr or not it is defective. One of them is taken out at random from this lot. Find the probability that the pen taken out taken out is good one.

total outcomes = 132 + 12 = 144 total favourable outcomes = 132 Probability=132144 = 1112

total outcomes = 132 + 12 = 144
total favourable outcomes = 132
Probability= $\frac{132}{144}$ = $\frac{11}{12}$