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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 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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MBD-Probability-Exercise
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  15. What will be the probability of event E + event not E ?

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  16. What will be the probability of an impossible event ? a. 0 b. 1 c. 2 d...

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