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A box contains 12 balls, out of which x ...

A box contains 12 balls, out of which x are black, (i) If one ball is drawn at random, what is the probability that it will be a black ball? (ii) If 6 more black balls are put in the bag, the probability of drawing a black ball will double than that in (i), find x.

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The correct Answer is:
Number of black balls are 3.
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