Two cards are drawn successively with replacement from a well-shuffled deck of 52 cards. The probability distribution of number of aces is given by: |
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The correct answer is Option (3) →
Let random variable $X$ = number of aces drawn in two draws (with replacement). Probability of getting an ace in one draw: $p=\frac{4}{52}=\frac{1}{13}$ Probability of not getting an ace: $q=1-p=\frac{12}{13}$ Since draws are independent (with replacement), $X$ follows a Binomial distribution: $n=2,\ p=\frac{1}{13}$ Hence, $P(X=0)=\left(\frac{12}{13}\right)^{2}=\frac{144}{169}$ $P(X=1)=2\cdot\frac{1}{13}\cdot\frac{12}{13}=\frac{24}{169}$ $P(X=2)=\left(\frac{1}{13}\right)^{2}=\frac{1}{169}$ Probability distribution:
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