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

A box contains 12 balls, out of which `x` are black. If 6 more black balls are put in the box, the probability of drawing a black ball will be doubled. Find `x`.

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CHETANA PUBLICATION-Probability-EXERCISE
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  9. A bag contains 3 red,3 white and 3 green balls.One ball is taken out o...

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  10. If two dice are rolled simultaeneously,find the probability of the fol...

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  14. What is the probability that an ordinary year has 53 sundays?

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  15. Find the probability that a leap year selected at random will have 53 ...

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  16. A missing helicopter is reported to have crashed somewhere in the rect...

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  17. Each coeffecient in equation ax^2+bx+c=0 is obtained by throwing an or...

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  18. A box contains 12 balls, out of which x are black. If one ball is draw...

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  19. A box contains 12 balls, out of which x are black. If 6 more black bal...

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