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प्रश्न
15 defective pens are accidentally mixed with 145 good ones. One pen is taken out at random from this lot. Determine the probability that the pen taken out is a good one.
बेरीज
उत्तर
Numbers of defective Pens = 15
Number of Good Pens = 145
Total Number of Pens = 15 + 145 = 160
Probability that pen taken out is good one = `"Number of Possible outcomes"/"Total Number of favourable outcomes"`
⇒ `145/160`
= `29/32`
Thus, Probability of good pen = `29/32`
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