This is a simple matter of Counting.
Exactly where is your difficulty?
Suppose you have a deck of 52 cards. .You are to draw one card.
Assume each card has a probability of 1/52 of being drawn.
What is the probability that you will draw:
a) the Ace of Spades?
b) the Ace of Spades or the Queen of Hearts?
How many outcomes are "winners?c) an Ace or a Spade?
. . (16 outcomes)