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12 defective pens are accidently mixe...

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

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The correct Answer is:
`(11)/(12)`
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MBD -HARYANA BOARD-PROBABILITY -SHORT ANSWER TYPE QUESTIONS
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