All High School Math Resources
Example Question #1 : Understanding Number Sets
If a card is drawn randomly from a regular shuffled 52 card deck, what is the probability that the card is either a spade or a 3?
How many cards in the deck are either a spade or a 3?
There are thirteen spades, including a 3 of spades.
There are four 3's, including a 3 of spades.
Since we are counting the same card (3 of spades) twice, there are actually
distinct cards that fit the criteria of being either a spade or a 3.
Since any of the 52 cards is equally likely to be drawn, the probability that it is a spade or a 3, is