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There are n letters and n addressed enve...

There are n letters and n addressed envelopes . If the letters are placed in the envelopes at random , what is the probability that all the letters are not placed in the right evelope ?

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`1-(1)/(n!)`
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ICSE-PROBABILITY -EXERCISE 22 (D )
  1. Four cards are drawn at random from a pack of 52 playing cards , Find...

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  2. Four cards are drawn at random from a pack of 52 playing cards , Find...

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  3. Four cards are drawn at random from a pack of 52 playing cards , Find...

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  4. Four cards are drawn at random from a pack of 52 playing cards , Find...

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  5. Four cards are drawn at random from a pack of 52 playing cards. Find ...

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  6. In a Iottery of 50 tickets numbered 1 to 50 , two tickets are drawn si...

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  7. In a Iottery of 50 tickets numbered 1 to 50 , two tickets are drawn si...

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  8. In a Iottery of 50 tickets numbered 1 to 50 , two tickets are drawn si...

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  9. Out of 9 outstanding students in a college, there are 4 boys and 5 ...

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  10. Four people are chosen at random from a group consisting of 3 men , 2...

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  11. A commitree of 5 principals is to be selected from a group of 6 gent p...

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  12. A bag contains tickets numbered 1 to 20 . Two tickets are drawn . Fin...

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  13. A bag contains tickets numbered 1 to 30. Three tickets are drawn at ...

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  14. A room has 3 lamps . From a collection of 10 light bulbs of which 6 ar...

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  15. A has 3 shares in a lottery containing 3 prizes and 9 blanks , B has ...

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  16. There are n letters and n addressed envelopes . If the letters are pla...

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  17. Three letters are written to different persons , and the addresses on ...

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  18. The letters of SOCIETY are placed at random in a row. What is the p...

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  19. In a random arrangement of the letters of the "COMMERCE" , find the p...

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  20. Given a group of 4 persoms , find the probability that no two of th...

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