. 10 defective pens are accidentally mixed with 65 good ones. It is not possible to just look at a pen and tell whether it is defective. One pen is taken out at random from this lot. Find the probability that the pen taken out is a good one.
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defective pens are accidentally mixed with 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.
Medium
Total no. of pens is good and defective ones
No. of good ones is
Therefore, times out a good pen is taken out.
Let be the event of taking a pen out.
We know that, Probability
Therefore, the probability that the pen taken out is 11\12
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