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Two marbles are drawn successively from a box containing 3 black and 4 white marbles. Find the probability that both the marbles are black, if the first marble is not replaced before the second draw. Select the correct answer from above options

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Probability of drawing first marble black = 3 7 Now, there are 2 black marbles and 7 total marbles. ∴ Probability of drawing second marble black = 2 6 ∴ Probability of drawing both marbles black = 3 7 ∗ 2 6 = 1 7

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