Q12 of 66 Page 15

A number is selected at random from the numbers 1 to 30. What is the probability that the selected number is a prime number?[CBSE 2014]

Let E be the event of selecting a prime number


Total numbers of elementary events are 30


Favourable numbers are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29


Number of favourable outcome = 10


P (E) = 10/30 =1/3

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