Home
Class 11
MATHS
A round-table conference is to be held a...

A round-table conference is to be held among 20 delegates belonging from 20 different countries. In how many ways can they be seated if two particular delegates are (i) always to sit together, (ii) never to sit together .

Promotional Banner

Topper's Solved these Questions

  • LOGARITHM

    CENGAGE PUBLICATION|Exercise All Questions|177 Videos

  • PROBABILITY

    CENGAGE PUBLICATION|Exercise All Questions|1 Videos

Similar Questions

Explore conceptually related problems

In how many ways can six students be seated in a line so that two particular students do not sit together?

In how many ways can the letters of the word CONSTANT be arranged keeping the two vowels always together ?

The number of ways in which 7 persons can be seated at a round table if twom particular persons are not to sit together is

In how many ways can 5 girls and 3 boys be seated in a row so that no two boys are together?

In how many ways can 5 girls and 3 boys be seated in a row so that no two boys are together ?

In how many ways can 3 ladies and 3 gentlemen be seated around a round table so that any two and only two of the ladies sit together?

Five boys and five girls sit alternately around a round table. In how many ways can this be done?

In how many ways can 6 boys and 4 girls be seated in a round table so that two girls never be seated together.

In how many ways can 10 boys and 5 girls be seated in a round table so that two girls never be seated together ?

How many different selections of 6 books can be made from 11 different book , if Two particular books are always selected ,

CENGAGE PUBLICATION-PERMUTATIONS AND COMBINATIONS-All Questions
  1. Prove that .^nPr = ^(n-1)Pr + r^(n-1)P(r-1)

    Text Solution

    |

  2. How many ways are there to seat n married couples (ngeq3) around a tab...

    Text Solution

    |

  3. A round-table conference is to be held among 20 delegates belonging fr...

    Text Solution

    |

  4. How many numbers can be formed from the digits 1, 2, 3, 4 when repetit...

    Text Solution

    |

  5. Find the three-digit odd numbers that can be formed by using the digit...

    Text Solution

    |

  6. If ^ n P5=20 ^nP3 find the value of n

    Text Solution

    |

  7. Find the total number of ways of selecting five letters from the word ...

    Text Solution

    |

  8. Passengers are to travel by a double decked bus which can accommodate ...

    Text Solution

    |

  9. Simplify the following and express it in the form (a+ib): (3+4i)(2-3i...

    Text Solution

    |

  10. In a conference 10 speakers are present. If S1 wants to speak before S...

    Text Solution

    |

  11. Five boys and five girls sit alternately around a round table. In how ...

    Text Solution

    |

  12. A regular polygon of 10 sides is constructed. In how many way can 3...

    Text Solution

    |

  13. If (n+3)! =56 x (n+1)!, Find the value of n.

    Text Solution

    |

  14. If .^15 C(3r):^(15)C(r+1)=11 :3 , find the value of rdot

    Text Solution

    |

  15. If the ratio .^2n C3:^n C3 is equal to 11:1 find ndot

    Text Solution

    |

  16. There are n married couples at a party. Each person shakes hand with e...

    Text Solution

    |

  17. Twenty-eight games were played in a football tournament with each team...

    Text Solution

    |

  18. Find the 28th term from the end term of the AP 6, 9, 12, 15, 18, ....,...

    Text Solution

    |

  19. In a network of railways, a small island has 15 stations. Find the ...

    Text Solution

    |

  20. A person tries to form as many different parties as he can, out of his...

    Text Solution

    |