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प्रश्न
A lot consists of 165 ball pens, of which 30 are defective and the others are good. Rakshita will buy a pen if it is good. The shopkeeper draws one pen at random and gives it to Rakshita. What is the probability that she will buy it?
योग
उत्तर
Let E be the event "Rasmita will buy a pen if it is good."
Now, according to question, the number of all possible outcomes of the experiment = 165
Number of outcomes favourable to E = 165 − 30 = 135
∴ `"P(E)" = 135/165`
= `9/11`
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