High School Math : Understanding Number Sets

Study concepts, example questions & explanations for High School Math

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Example Questions

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?

Possible Answers:

Correct answer:

Explanation:

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

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