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Question
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 boy.
Solution
Total number of students = 35
Number of boys = 20
Number of girls = 15
Let E1 be the event that the chosen student is a boy.
∴ P(choosing a boy) = P(E1) = `("Number of outcomes favourable to ""E"_1)/ "Number of all possible outcome" = 20/35 = 4/7`
Thus, the probability that the chosen student is a boy is `4/7`
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