Question

Find the probability that the card drawn is a card of spades or na ace?

Answer 1

the probability of a spade or an ace card=favourable event/total event                                                                                       =16/52=8/13                                                                       spade cards=13                                                         ace cards=4                                                   there is one card which is a spade ace. so, 13+4-1=16

Answer 2

its very simple it would be 12/13
no of spade = n(S) =4
no of non ace n(A') = 48
n (S and A')= 4
hence
P(S or A')=P(S)+P(A')-P(S and A') = 4/52 + 48/52 - 4/52 = 12/13.