This question was asked in Ex 15.1, 21

12 defective pen 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.

Jas Dhiman

April 8, 2020, 8:10 p.m.

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