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प्रश्न
There are 35 students in a class of whom 20 are boys and 15 are girls. From these students one is chosen at random. What is the probability that the chosen student is a girl?
उत्तर
Let E2 be the event that the chosen student is a girl.
∴ P(choosing a girl) = P(E2) =`("Number of outcome favourable to" E_2)/"Number of all possible outcome"= 15/35 = 3/7`
Thus, the probability that the chosen student is a girl is `3/7.`
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