Question

Cards marked with numbers 1, 2, 3, 4, .....20 are well shuffled and a card is drawn at random. What is the probability that the number on the card is
(i) a prime number
(ii) divisible by 3
(iii) a perfect square ?

Answer 1

see attachment....hope it will help u

Answer 2

1) 7/20
2)6/20= 3/10
3) 3/20