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

A box contains 12 balls out of which x are black, IF one ball is drawn at random from the box, what is the probability that it will be a black ball? If 6 more black balls are put in the box, the probability of drawing a black ball is now double of what it was before Find x.

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VGS PUBLICATION-BRILLIANT-PROBABILITY-EXERCISE

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