Question

In a raffle, Carlos buys 12 tickets and his friend Daniel buys 20 tickets. If there are 80 tickets sold, what is the probability that Carlos or Daniel will win?

Answer 1

together the probability is 0.4 seperate carlos is 0.15 and daniel probability is 0.25

Answer 2

Probability Carlos winning = 12 / 80
and probability of Daniel win  = 20 /80

as this is an OR question we add these 
so answer is 12/80 + 20/80  = 32/80  = 2/5