Home
Class 12
MATHS
A letter lock contains 4 rings, each rin...

A letter lock contains 4 rings, each ring containing 5 letters. All possible trails are made to open the lock and the lock opens in only one way. The probability for the lock to open is

A

`1//20`

B

`1//625`

C

`1//1024`

D

`4//5`

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • PROBABILITY

    DIPTI PUBLICATION ( AP EAMET)|Exercise EXERCISE-1B|62 Videos

  • PROBABILITY

    DIPTI PUBLICATION ( AP EAMET)|Exercise EXERCISE-1C|142 Videos

  • PROBABILITY

    DIPTI PUBLICATION ( AP EAMET)|Exercise EXERCISE 2 (SPECIAL TYPE QUESTIONS) SET-4|5 Videos

  • PERMUTATIONS & COMBINATIONS

    DIPTI PUBLICATION ( AP EAMET)|Exercise EXERCISE 2 ( SPECIAL TYPE QUESTIONS ) SET -4|10 Videos

  • PRODUCTS OF VECTORS

    DIPTI PUBLICATION ( AP EAMET)|Exercise Exercise 2 (Special Type Questions) SET -D|14 Videos

Similar Questions

Explore conceptually related problems

A number lock contains 4 rings each ring containing 6 numbers . All the possible attempts of opening the lock are made but the lock opens in only one way. The probability for the lock to open is

a Letter lock contains 5 rings each marked with four different letters . The number of all possible iunsuccesful attempts to open the lock is

A letter lock consists of three rings each marked with 5 different letters. Number of maximum attempts to open the lock is

A letter lock consists of three rings each marked with 10 different letters. No. of ways to make an unsuccessful attempts to open the lock is

Bag A contains 4 white, 3 black balls. Bag B contains 3 white and 5 black balls. One ball is drawn from each bag. The probability that both are black is

Tanks A and B open at the top contain two different liquids upto certain height in them. A hole is made to the wall of each tank at a depth h from the surface of the liquid. The area of the hole in B is twice that of in A. If the liquid mass flux through each hole is equal, then the ratio of the densities of the liquids respectively, is

A letter lock consists of 4 rings each marked with 10 different letters, the number of ways in which it is possible to make an unsuccessful attempts to open the lock is

Bag A contains 4 white, 3 black balls. Bag B contains 3 white ad 5 black balls. One ball is drawn from each bag. The probability that one is white and one is black is

DIPTI PUBLICATION ( AP EAMET)-PROBABILITY-EXERCISE-1A
  1. The probability that when 12 balls are distributed among three boxes, ...

    Text Solution

    |

  2. A contest consists of predicting the result (win, draw and loss) 5 foo...

    Text Solution

    |

  3. A letter lock contains 4 rings, each ring containing 5 letters. All po...

    Text Solution

    |

  4. There are 5 letters and 5 addressed envelopes. If the letters are put ...

    Text Solution

    |

  5. There are 5 letters and 5 addressed envelopes. If the letters are put ...

    Text Solution

    |

  6. If four squares are chosen at random on a chess board, then the probab...

    Text Solution

    |

  7. If four squares are chosen at random on a chess board, then the probab...

    Text Solution

    |

  8. If 7 squares are chosen at random on a chess board, the probability th...

    Text Solution

    |

  9. Two squares of a chess board are chosen at random, the probability tha...

    Text Solution

    |

  10. Three squares of a chess board are chosen at random, the probability t...

    Text Solution

    |

  11. A determinant is chosen at random from the set of all determinants of ...

    Text Solution

    |

  12. A determinant is chosen at random from the set of all determinants of ...

    Text Solution

    |

  13. The number of 3xx3 non-singular matrices, with four entries as 1 and a...

    Text Solution

    |

  14. 3 out of 6 vertices of a regular hexagon are chosen at a time at rando...

    Text Solution

    |

  15. A bag contains n white and n black balls. Pairs of balls are drawn un...

    Text Solution

    |

  16. The number of subesets contining atmost 3 elements that can be picked ...

    Text Solution

    |

  17. The number of subesets contining atmost 2 elements that can be picked ...

    Text Solution

    |

  18. S is a set containing n elements. If two subsets A and B of S picked a...

    Text Solution

    |

  19. A mapping is selected at random from the set of all the mappings of th...

    Text Solution

    |

  20. A mapping is selected at random from the set of all the mappings of th...

    Text Solution

    |