Question

A box contains 20 cards from 1 to 20.A card is drawn at random from the box.Find the probability that the number on the card is (1)divisible by 2 or 3 (2) a prime number

Answer 1

1) Total events=20

Favourable events=13 (2,3,4,6,8,9,10,12,14,15,16,18,20)

P(E)=13/20

2) Total events=20

Favourable events=8

(2,3,5,7,11,13,17,19)

P(E)=8/20=2/5