Home
Class 14
MATHS
An old person forgets the last two digit...

An old person forgets the last two digits of a telephone number, remembering only that these are different dialled at random. The probability that the number is dialled correctly is :

A

`1//90`

B

`81//91`

C

`2//99`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • PROBABILITY

    ARIHANT SSC|Exercise EXERCISE (LEVEL-2)|19 Videos

  • PROBABILITY

    ARIHANT SSC|Exercise INTRODUCTORY EXERCISE -(20.4)|41 Videos

  • PRACTICE SET

    ARIHANT SSC|Exercise PRACTICE SET-5|50 Videos

  • PROBLEM BASED ON AGES

    ARIHANT SSC|Exercise FASK TRACK PRACTICE|31 Videos

Similar Questions

Explore conceptually related problems

Dialling a telephone number an old man forgets the last two digits remembering only that these are different dialled at random.The probability that the number is dialled correctly is 1/45b.1/90 c.1/100 d.none of these

Dialing a telephone number an old man forgets the last two digits remambering only that these are different dialled at random. The probability that the numbe is dialled correctly, is equal to 1/k, then k is

Dialing a telephone number, an old man forgets the last two digits remembering only that they are different, dialled at random. The probability that the number is dialled incorrectly

Write last two digits of the number 3^(400)

The last two digit of the number (17)^(10)

The last two digits of the number 7^(20), is:

What are the last two digits of the number 9^(200)

The last two digits of the number 23^(892) is

ARIHANT SSC-PROBABILITY-EXERCISE (LEVEL-1)
  1. How many years will it take for amount of rs. 600 to yield rs. 120 as ...

    Text Solution

    |

  2. A sum of rs. 15000 amount gave rs. 4500 as interest in 5year. what is...

    Text Solution

    |

  3. Two integers x and y are chosen with replacement out of the set {0, 1,...

    Text Solution

    |

  4. What would be the C.I. on amount rs. 12500 at the rate of 12% p.a. aft...

    Text Solution

    |

  5. If 6 objects are distributed at random among 6 persons, the probabilit...

    Text Solution

    |

  6. The difference between simple and compound interest compounded annuall...

    Text Solution

    |

  7. Four numbers are multiplied together. Then the probability that the pr...

    Text Solution

    |

  8. 8 couples (husband and wife) attend a dance show "Nach Baliye' in a po...

    Text Solution

    |

  9. Three persons A,B and C are to speak at a function along with five oth...

    Text Solution

    |

  10. A bag contains 16 coins of which 2 coins are counterfeit with heads on...

    Text Solution

    |

  11. A committee of five persons is to be chosen from a group of 9 people. ...

    Text Solution

    |

  12. A speaks truth in 60% cases and B speaks truth in 70% cases. The proba...

    Text Solution

    |

  13. Two squares are chosen at random on a chessboard, the probability that...

    Text Solution

    |

  14. An old person forgets the last two digits of a telephone number, remem...

    Text Solution

    |

  15. Three squares of a chessboard are chosen at random. the probability th...

    Text Solution

    |

  16. The probability that a leap year selected ar random contains either 53...

    Text Solution

    |

  17. In order to get atleast once a head with probability P ge 0.9. the num...

    Text Solution

    |

  18. Out of 13 applicants for a job, there are 5 women and 8 men It is desi...

    Text Solution

    |

  19. The difference between C.I. and S.I. on rs. 700 in 2 years at 5% p.a. ...

    Text Solution

    |

  20. Seven digits from the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 are written...

    Text Solution

    |