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12 defective pens are accidentally mixed with 132 good ones. It is not possible to just look at a 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 a good one. Q.16

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What is the best way for solving the problem of question no.16 from Probability chapter of exercise 15.1 of class 10th ncert, how i solve this question in easy and simple way because it is very important for class 10th board. 12 defective pens are accidentally mixed with 132 good ones. It is not possible to just look at a 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 a good one.

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  1. Numbers of pens = Numbers of defective pens + Numbers of good pens

    ∴ Total number of pens = 132+12 = 144 pens

    P(E) = (Number of favourable outcomes/ Total number of outcomes)

    P(picking a good pen) = 132/144 = 11/12 = 0.916

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