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In a pack of $52$ playing cards one card is lost. From the remaining cards, a card is drawn at random. Find the probability that the drawn card is queen of heart, if the lost card is a black card.
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Sol. Total number of remaining cards = $51$
P (getting queen of heart) = $\frac{1}{51}$
P (getting queen of heart) = $\frac{1}{51}$