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A card is drawn from a pack of 52 playing cards. What is the probability that it is a diamond card known that drawn card is red ?

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Probability of getting a red card ` = 26/52 = 1/2`
We are given that drawn card is red.
Now, probability of drawing a diamond card ` = 13/52 = 1/4`
As, we know drawn card is red, probabilty of drawing a damond card ` = (1/4)/(1/2) = 1/2`

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