Cards marked with numbers 1,3, 5……………..101 are placed In a bag and mixed thoroughly. A card Is drawn at random from the bag. Find the probability that the number on the drawn card Is
(I)less than 19,
(II) a prime number less than 20.

CBSE, Class 11, Exercise 15.2, Exercise 8.2, Maths, Probability, RS Aggarwal