Home
Class 11
MATHS
A person tries to form as many different...

A person tries to form as many different parties as he can, out of his 20 friends. Each party should consist of the same number. How many friends should be invited at a time ? In how many of these parites would the same friends be found ?

A

5

B

10

C

8

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • PERMUTATIONS AND COMBINATIONS

    OBJECTIVE RD SHARMA ENGLISH|Exercise Chapter Test|60 Videos

  • PERMUTATIONS AND COMBINATIONS

    OBJECTIVE RD SHARMA ENGLISH|Exercise Section II - Assertion Reason Type|9 Videos

  • PARABOLA

    OBJECTIVE RD SHARMA ENGLISH|Exercise Chapter Test|30 Videos

  • PROBABILITY

    OBJECTIVE RD SHARMA ENGLISH|Exercise Chapter Test|45 Videos

Similar Questions

Explore conceptually related problems

A person wants to hold as many different parties as he can out of 24 friends, each party consisting of the same number. How many should he invite at a time? In how many of these would the same man be found?

If out of 6 flags any number of flags can be shown at a time find how many different signals can be made out of them.

In how many ways can I invite one or more six friends to a dinner?

A man has 7 friends and he wants to invite 3 of them at a party. Find how many parties to each of 3 different friends he can give and how many times any particular friend will attend the parties?

Ravi distributes 6 marbles to each of his friends and runs short by 4 marbles. If the number of his friends is f, how many marbles he had?

Two boys can paint a fence in 5 hours. How many hours would it take 3 boys to paint the same fence?

Craig invited four friends to watch a TV show. He arranged 5 seats in a row. The number of ways he and his four friends can sit in the row is n. In how many of these ways can Craig sit in the middle?

A committee of 3 persons is to be constituted from a group of 2 men and 3 women. In how many ways can this be done? How many of these committees would consist of 1 man and 2 women?

A committee of 3 persons is to be constituted from a group of 2 men and 3 women. In how many ways can this be done? How many of these committees would consist of 1 man and 2 women?

A committee of 3 persons is to be constituted from a group of 2 men and 3 women. In how many ways can this be done? How many of these committees would consist of 1 man and 2 women?

OBJECTIVE RD SHARMA ENGLISH-PERMUTATIONS AND COMBINATIONS-Exercise
  1. A box contains 4 white balls, 5 black balls and 2 red balls. The numbe...

    Text Solution

    |

  2. Find the number of different permutations of the letters of the word ...

    Text Solution

    |

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

    Text Solution

    |

  4. Find the number of ways in which 8 different flowered can be strung to...

    Text Solution

    |

  5. The number of words which can be formed out of the letters a, b, c, d,...

    Text Solution

    |

  6. The smallest value of x satisfying the inequality ""^(10)C(x-1)gt2.""^...

    Text Solution

    |

  7. The number of arrangenments which can be made using all the letters of...

    Text Solution

    |

  8. The number of ways of choosing a committee of 4 women and 5 men from 1...

    Text Solution

    |

  9. A set contains 2n+1 elements. The number of subsets of this set conta...

    Text Solution

    |

  10. The number of ways in which any four letters cab be selected from the ...

    Text Solution

    |

  11. A 5 digit number divisible by 3 is t formed sing the digits 0,1,2,3,4 ...

    Text Solution

    |

  12. If 7 points out of 12 are in the same straight line, then the number o...

    Text Solution

    |

  13. If a denotes the number of permutations of (x+2) things taken all at a...

    Text Solution

    |

  14. There are number of seats and m number of people have to be seated, th...

    Text Solution

    |

  15. There are 5 letters and 5 directed envelopes. The number of ways in wh...

    Text Solution

    |

  16. Find the number of ways of selecting 10 balls out o fan unlimited n...

    Text Solution

    |

  17. The total number of different combinations of letters which can be mad...

    Text Solution

    |

  18. The total number of six-digit natural numbers that can be made with...

    Text Solution

    |

  19. The number of numbers of 7 digits whose sum of digits is even, is

    Text Solution

    |

  20. All possible four-digit numbers have formed using the digits 0, 1, 2, ...

    Text Solution

    |