If 2 cards are drawn from a deck of cards, how do you find P(heart or club)?
The above explains the probability of drawing a heart or club in one draw very well. Now let's move over to P(heart or club) when drawing two cards.
This is a bit more complicated. There are two possibilities:
(1) You've already drawn a 'right' at the first draw
as explained above
(2) You didn't.
Then there are 51 cards left: 26 'rights' and 25 'wrongs'. Probability of getting a 'right' in the second draw
You may add the probabilities of cases (1) and (2):