One card is selected at random from a standard deck, then replaced, and a second card is drawn. Find the probability of selecting two face cards.
Question
One card is selected at random from a standard deck, then replaced, and a second card is drawn. Find the probability of selecting two face cards.
Solution
Sure, here is the step by step solution:
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A standard deck of cards has 52 cards: 4 suits (hearts, diamonds, clubs, spades) each with 13 cards (Ace through 10, and the face cards Jack, Queen, King).
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The face cards are the Jack, Queen, and King, which are 3 cards in each suit. So, there are 3 face cards/suit x 4 suits = 12 face cards in a deck.
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The probability of drawing one face card from the deck is the number of face cards divided by the total number of cards, or 12/52 = 0.23076923076923078.
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Because the card is replaced, the deck is back to 52 cards for the second draw, and the probability of drawing a face card remains the same, 12/52 = 0.23076923076923078.
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The probability of both events happening (drawing a face card, replacing it, then drawing another face card) is the product of the probabilities of each event. So, the probability of drawing two face cards with replacement is 0.23076923076923078 x 0.23076923076923078 = 0.05325443786982249, or approximately 0.0533 or 5.33% when rounded to four decimal places or two decimal places respectively.
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