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प्रश्न
A lot consists of 144 ball pens of which 20 are defective and the others are good. Tanu will buy a pen if it is good but will not buy it if it is defective. The shopkeeper draws one pen at random and gives it to her. The probability that she will buy that pen is ____________.
पर्याय
`5/36`
`20/36`
`31/36`
`31/144`
MCQ
रिकाम्या जागा भरा
उत्तर
A lot consists of 144 ball pens of which 20 are defective and the others are good. Tanu will buy a pen if it is good but will not buy it if it is defective. The shopkeeper draws one pen at random and gives it to her. The probability that she will buy that pen is `underline(31/36)`.
Explanation:
Total ball pens = 144
Defective ball pens = 20
Good ball pens = 144 - 20 = 124
`therefore "P(she will buy a pen) = P(good ball pen)" = 124/144 = 31/36`
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