Q. 464.8( 5 Votes )

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 lit. Determine the probability that the pen taken out is good one.

Answer :

Total number of possible outcomes, n(S) = 144

Number of favorable outcomes, n(E) = 132



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