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

A box contains 12 balIs 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 the box,the probability of drawing a black ball is now double of what it was before. find x.

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R G PUBLICATION-PROBABILITY-EXERCISE
  1. Two customers Shyam and Ekta are visiting a particular shop in the sam...

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  2. A bag contains red balls and some blue balls. If the probability of dr...

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  3. A box contains 12 balIs out of which x are black.If one ball is drawn ...

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  4. A jar contains 24 marbles, some are green and others are blue. If a ma...

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  5. A die is thrown once what is the probability of getting a prime number...

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  6. A die is thrown once What is the probability of getting an odd number?

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  7. A die is thrown once. Find the probability of getting (ii) a number ly...

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  8. A die is thrown once. What is the probability of getting a number grea...

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  9. A one rupee coin was tossed for once only. Find the probability of get...

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  10. A bag contains 5 red, 8 green and 7 white balls. One ball is drawn at ...

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  11. From a well shuffled pack of cards a card is drawn at random. Find the...

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  12. If barE denote the complement or negation of an event E, what is the v...

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  13. If P(E) =0.05, what is the probability of not 'E'?

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  14. Two coins are tossed simultaneously. Find the probability of getting e...

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  15. The probability of a sure event is

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  16. The probability of an impossible event is

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  17. For any event E, the value of complementary event E is

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  18. For any event E the value of P(E). is then 1 and greater than 0

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  19. Fill in the blanks :(iii)If W1,W2,W3,…..Wnare all the equally likely a...

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  20. In a threw of a die the probability of getting 4 is

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