Cards bearing numbers 2, 3, 4, ....., 11 are kept in a bag. The probability of getting a card with a prime number is

Total numbers of elementary events are 10

Let E be the event of getting a prime number

Favourable numbers are: 2, 3, 5, 7, 11

Numbers of favourable outcomes = 5

P (E) = 5/10 =1/2