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