Due to some reason,12 faulty pens are mixed with 132 non-faulty pens. By inspection we cannot judge that pen is faulty or not .If one pen is randomly chosen, then what is the probability of getting non- faulty pen?
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total no of pens = 132 + 12 = 144
favourable chances of getting a non faulty pen = 132
probability of getting a non faulty pen
= 132 / 144 = 11/12
favourable chances of getting a non faulty pen = 132
probability of getting a non faulty pen
= 132 / 144 = 11/12
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