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Sagot :
Answer:
[tex]\dfrac{2}{169}[/tex]
Step-by-step explanation:
A standard 52-card deck comprises 4 suits (Spades, Hearts, Diamonds, and Clubs).
Each suit comprises 10 numerical cards (numbered 2 through 10, plus an "ace") and 3 "court" cards (jack, queen and king).
Therefore:
- The total number of possible outcomes is 52.
- There are 4 kings and 4 queens in a standard deck of cards.
[tex]\boxed{\sf Probability\:of\:an\:event\:occurring = \dfrac{Number\:of\:ways\:it\:can\:occur}{Total\:number\:of\:possible\:outcomes}}[/tex]
[tex]\implies \sf P(Queen)=\dfrac{4}{52}=\dfrac{1}{13}[/tex]
[tex]\implies \sf P(King)=\dfrac{4}{52}=\dfrac{1}{13}[/tex]
Therefore, the probability of drawing a king, replacing the card, and drawing a queen is:
[tex]\implies \sf P(King)\;and\;P(Queen)=\dfrac{1}{13}\times \dfrac{1}{13}=\dfrac{1}{169}[/tex]
Similarly, the probability of drawing a queen, replacing the card, and drawing a king is:
[tex]\implies \sf P(Queen)\;and\;P(King)=\dfrac{1}{13}\times \dfrac{1}{13}=\dfrac{1}{169}[/tex]
Therefore, the probability of drawing a king then a queen, or a queen then a king is:
[tex]\implies \sf P(King\;and\;Queen)\;or\;P(Queen\;and\;King)=\dfrac{1}{169}+\dfrac{1}{169}=\dfrac{2}{169}[/tex]
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