Home
Class 11
MATHS
Find n if ""^nC4 , ""^nC5 and ""^nC6 are...

Find n if `""^nC_4 , ""^nC_5` and `""^nC_6` are in A.P.

Promotional Banner

Topper's Solved these Questions

  • PERMUTATIONS AND COMBINATIONS

    MODERN PUBLICATION|Exercise EXERCISE|319 Videos

  • MATHEMATICAL REASONING

    MODERN PUBLICATION|Exercise EXERCISE|169 Videos

  • PROBABILITY

    MODERN PUBLICATION|Exercise EXERCISE|348 Videos

Similar Questions

Explore conceptually related problems

Find n if "^nC_2 = ^nC_3 .

If "^nC_8 = "^nC_2 , find "^nC_2 .

If "^nC_8= ^nC_2 , find "^nC_2 .

If ""^nC_r= ""^nC_s , then n is:

If ""^nC_8= ""^nC_9 , then n is:

Determine n if "^(2n)C_3 : "^nC_3 =12:1

If nC_6=nC_2 , find ^nC_2 .

Determine n if "^(2n)C_3 : "^nC_3 = 11 : 1

If ^nC_(r-1)=36 , ^nC_r=84 and ^nC_(r+1)=126 , then find ^rC_2 .

MODERN PUBLICATION-PERMUTATIONS AND COMBINATIONS-EXERCISE
  1. Prove that "^(n-1)C3+ ^(n-1)C4 > ^nC3 if n >7.

    Text Solution

    |

  2. Verify that ""^nCr= frac (n)(r) "^(n-1)C(r-1) and hence prove that "^n...

    Text Solution

    |

  3. Find n if ""^nC4 , ""^nC5 and ""^nC6 are in A.P.

    Text Solution

    |

  4. In how many ways can 5 sportsmen be selected from a group of 10 ?

    Text Solution

    |

  5. How many selections of 4 books can be made from 8 different-books ?

    Text Solution

    |

  6. A committee of 2 boys is to be selected from 4 boys. In how many ways ...

    Text Solution

    |

  7. In how many ways can a committee be selected from 15 persons if the co...

    Text Solution

    |

  8. In how many ways can a committee be selected from 15 persons if the co...

    Text Solution

    |

  9. Sudha wants to choose any 9 stamps from a set of 11 different stamps. ...

    Text Solution

    |

  10. How many lines can be drawn through 6 points on a circle ?

    Text Solution

    |

  11. How many triangles can be drawn through n points on a circle ?

    Text Solution

    |

  12. A polygon has 44 diagonals, find the number of its sides.

    Text Solution

    |

  13. Find the number of diagonals of a : pentagon .

    Text Solution

    |

  14. Find the number of diagonals of a : octagon .

    Text Solution

    |

  15. If there are 12 persons in a party, and if each two of them shake hand...

    Text Solution

    |

  16. In a student's reunion meeting in a school, 16 students show up. Each ...

    Text Solution

    |

  17. How many different committees, each consisting of 3 girls and 2 boys c...

    Text Solution

    |

  18. In how many ways can a team of 3 boys and 3 girls be selected from 5 b...

    Text Solution

    |

  19. Find the number of ways of selecting 9 balls from 6 red balls, 5 white...

    Text Solution

    |

  20. A bookshelf contains 7 different Mathematics textbooks and 5 different...

    Text Solution

    |