Answer:
3/10
Explanation:
You want the probability of two blue cards if the first is drawn with replacement, and is blue.
P(blue)
The probability of drawing a blue card is the same as the fraction of cards that are blue: 3/10. The joint probability of two blues is the product of their individual probabilities. Since we are certain the first card is blue, its probability is 1.
P(2 blue) = P(first blue) · P(second blue)
P(2 blue) = 1 · 3/10 = 3/10
The probability of drawing 2 blue cards, given the first one is blue, is 3/10.
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