From standard pack of 52 cards, 3 cards are drawn at random without replacement. The probability of drawing a king, a queen and a jack in order is

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SSC CGL Tier-II ( JSO ) 2021 Official Paper ( Held On: 10 August 2022 )
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  1. \(\frac{4}{16575}\)
  2. \(\frac{16}{16575}\)
  3. \(\frac{8}{16575}\)
  4. \(\frac{32}{16575}\)

Answer (Detailed Solution Below)

Option 3 : \(\frac{8}{16575}\)
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Detailed Solution

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The correct answer is \(\frac{8}{16575}\)

Key Points

  • The probability of drawing a king, a queen and a jack in order is the product of the probabilities of drawing each card. 
  • There are 4 kings, 4 queens, and 4 jacks in a standard deck of 52 cards, so the probability of drawing any one of them is 4/52.
    • The first card can be any of the 3 cards in order. The probability of drawing a king first is \(\frac{4}{52}\)
    • The second card can be either a queen or a jack, but it cannot be the same as the first card. 
  • There are 4 queens or jacks left, and 51 cards in total, so the probability of drawing the second card is \(\frac{4}{51}\)
  • The same logic applies for the third card, and the probability of drawing a queen or a jack is \(\frac{4}{50}\).
    • Therefore, the probability of drawing a king, a queen, and a jack in order is \(\frac{4}{52} * \frac{4}{51} *\frac{4}{50} = \frac{8}{16575}\)}

Additional Information

  • The number of each card in the deck affects the probability of drawing them.
  • The order of drawing the cards affects the final probability.
  • This problem assumes that the cards are drawn without replacement, which means that once a card is drawn, it is not returned to the deck.
  • The problem calculates the probability of drawing the cards in a specific order, but there are other ways to calculate the probability of drawing a specific combination of cards, regardless of order.
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