Question

a box contains 20 cards, numbered from 1 to 20. one card is drawn at random. b is the even that the card drawn bwara a numbwr whixh is greater than 40, then m(b) is_---

Answer 1

s=(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20)

n(s)=20

B={-}

n(B)=0