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There are 4 letters and 4 addressed enve...

There are 4 letters and 4 addressed envelopes. Find the probability that all the letters are not dispatched in right envelopes.

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RD SHARMA ENGLISH-PROBABILITY-All Questions
  1. A bag contains 7 white, 5 black and 4 red balls, find the probability ...

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  2. If n persons are seated on a round table, what is the probability tha...

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  3. There are 4 letters and 4 addressed envelopes. Find the probability ...

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  4. Each coefficient in the equation a x^2+b x+c=0 is determined by throwi...

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  5. Prove that a^3+b^3+c^3-3abc=1/2(a+b+c){(a-b)^2+(b-c)^2+(c-a)^2}

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  6. Three squares of Chess board are selected at random. Find the probab...

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  7. In a simultaneous throw of a pair of dice, find the probability of g...

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  8. In a single throw of three dice, find the probability of getting a tot...

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  9. A bag contain 8 red and 5 white balls. Three balls are drawn at random...

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  10. If a person visits his dentist, suppose the probability that he will ...

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  11. A die has two faces each with number 1, three faces each with number ...

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  12. One of the four persons John, Rita, Aslam or Gurpreet will be promoted...

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  13. In a town of 6000 people 1200 are over 50 years old and 2000 are fe...

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  14. An urn contains twenty white slips of paper numbered from 1 through 20...

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  15. An integer is chosen at random from the numbers ranging from 1 to 50. ...

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  16. A basket contains 20 apples and 10 oranges out of which 5 apple and 3 ...

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  17. One cards are drawn from a pack of 52 cards. What is the probability t...

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  18. If A and B are any two events such that P(AuuB)=1/2 and P( A )=2/3 , ...

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  19. Let A ,B ,C be three events such that P(A)=0. 3 ,P(B)=0. 4 ,P(C)=0. 8 ...

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  20. A and B are two non-mutually exclusive events. If P(A)=1/4, P(B)=2/5 a...

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