Notice how much these two probabilities differ. That would give a total of 38 cards, but it would count the red face cards twice. That is a total of 26 + 6 = 32 cards.īe careful not to just add up the number of face cards (12) with the number of red cards (26). year ago I wrote a balanced review of some of the Khan Academy videos about statistics. In addition, there are 6 more face cards that are not red: Jack of Clubs, Queen of Clubs, King of Clubs, Jack of Spades, Queen of Spades, and King of Spades. Khan academy probability videos and exercises arent good either. There are 26 red cards (6 of which are also face cards). Factorial and counting seat arrangements Probability and Statistics Khan Academy. This time the card can be red, or a face card, or both at the same time. What is the probability of drawing a card from a deck and it being red or a face card? There are 6 of these: Jack of Hearts, Queen of Hearts, King of Hearts, Jack of Diamonds, Queen of Diamonds, and King of Diamonds. What is the probability of drawing a card from a deck and it being red and a face card?įor this probability, we need to look at which cards are both red and face cards. Let's look at one probability in these two ways: AND Probability
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