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Probability

Question 4:

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.

Answer:

Total number of balls = 12

Total number of black balls = x

P (getting a black ball) ...

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