Home
Class 11
MATHS
If \ ^(15)Cr :\ ^(15)C(r-1)=11 :5 find r...

If `\ ^(15)C_r :\ ^(15)C_(r-1)=11 :5` find r

Text Solution

AI Generated Solution

To solve the problem given, we need to find the value of \( r \) such that \[ \frac{^{15}C_r}{^{15}C_{r-1}} = \frac{11}{5} \] ### Step-by-Step Solution: ...
Promotional Banner

Topper's Solved these Questions

  • BRIEF REVIEW OF CARTESIAN SYSTEM OF RECTANGULAR COORDINATES

    RD SHARMA|Exercise Solved Examples And Exercises|75 Videos

  • COMPLEX NUMBERS

    RD SHARMA|Exercise Solved Examples And Exercises|267 Videos

Similar Questions

Explore conceptually related problems

If .^15C_r:^15C_(r-1)=11:5 , find r

If ^(15)C_(3r):^(15)C_(r+1)=11:3, find the value of r

If .^(15)C_(r): .^(15)C_(R-1) = 11:5 , then find the value of 'r'.

If .^(15)C_(r): .^(15)C_(r-1) = 1:5 , then find r.

If ""^(15)C_(3r) = ""^(15)C_(r+3) , find r.

If ^(15)C_(3r)=^(15)C_(r+3), then find r

If ^(n+1)C_(r+1): ^nC_r: ^(n-1)C_(r-1)=11:6:2 find the values of n and r.

If .^(n+1)C_(r+1): .^(n)C_(r)=11:6 and .^(n)C_(r): .^(n-1)C_(r-1)=6:3 , find n and r.

RD SHARMA-COMBINATIONS-Solved Examples And Exercises
  1. If \ ^(24)Cx=\ ^(24)C(2x+3) find x

    Text Solution

    |

  2. If \ ^(15)C(3r)=\ ^(15)C(r+3),find r

    Text Solution

    |

  3. If \ ^(15)Cr :\ ^(15)C(r-1)=11 :5 find r

    Text Solution

    |

  4. If \ ^(28)C(2r):\ ^(24)C(2r-4)=225 : 11 ,find r

    Text Solution

    |

  5. If \ ^(2n)C3:\ ^n C2=44 :3, find n

    Text Solution

    |

  6. If alpha=\ \ ^m C2,\ then find the value of \ ^(alpha)C2dot

    Text Solution

    |

  7. For all positive integers n , show that \ ^(2n)Cn+\ ^(2n)C(n-1)=1/2(\ ...

    Text Solution

    |

  8. From a class of 32 students, 4 are to be chosen for a competition. In ...

    Text Solution

    |

  9. Three gentlemen and three ladies are candidates for two vacancies. A ...

    Text Solution

    |

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

    Text Solution

    |

  11. A question paper has two parts, Part A and party B each containing 10 ...

    Text Solution

    |

  12. In how many ways a committee of 5 member can be selected from 6 men an...

    Text Solution

    |

  13. A committee of 3 persons is to be constituted from a group of 2 men...

    Text Solution

    |

  14. What is the number of ways of choosing 4 cards from a pack of 52 pl...

    Text Solution

    |

  15. Out of 5 men and 2 women, a committee of 3 is to be formed. In how man...

    Text Solution

    |

  16. For the post of 5 teachers, there are 23 applicants, 2 posts are re...

    Text Solution

    |

  17. How many triangles can be formed by joining the vertices of a hexagon?

    Text Solution

    |

  18. A polygon has 44 diagonals. The number of its sides are

    Text Solution

    |

  19. From a class of 25 students, 10 are to be chosen for an excursion p...

    Text Solution

    |

  20. In how many ways can 7 plus (+) and 5 minus (-) signs be arranged in a...

    Text Solution

    |