Home
Class 11
MATHS
If \ ^n Cr+\ ^n C(r+1)=\ \ ^(n+1)Cx ,\ t...

If `\ ^n C_r+\ ^n C_(r+1)=\ \ ^(n+1)C_x ,\ t h e n x =` a. `r` b. `r-1` c. `n` d. `r+1`

Text Solution

AI Generated Solution

Promotional Banner

Topper's Solved these Questions

  • BRIEF REVIEW OF CARTESIAN SYSTEM OF RECTANGULAR COORDINATES

    RD SHARMA ENGLISH|Exercise All Questions|77 Videos

  • COMPLEX NUMBERS

    RD SHARMA ENGLISH|Exercise All Questions|269 Videos

Similar Questions

Explore conceptually related problems

If .^(n+1)C_(r+1) :^n C_r :^(n-1)C_(r-1)=11 :6:3, then n r=? a. 20 b. 30 c. 40 d. 50

If ^n P_r=^n P_(r+1)a n d^n C_r=^n C_(r-1,) then the value of n+r is.

For ""^(n) C_(r) + 2 ""^(n) C_(r-1) + ""^(n) C_(r-2) =

If .^(n+1)C_(r+1):^n C_r:^(n-1)C_(r-1)=11 :6:3, then n r= 20 b. 30 c. 40 d. 50

If .^(n)C_(r-1)=36, .^(n)C_(r)=84 and .^(n)C_(r+1)=126 , find n and r.

.^(n)C_(r)+2.^(n)C_(r-1)+.^(n)C_(r-2)=

If n P_r=^n P_(r+1) and n C_r=^n C_(r-1,) then the value of (n+r) is.

If .^(n-1)C_r:^nC_r:^(n+1)C_r=6:9:13 find n and r.

""^(n)C_(r+1)+^(n)C_(r-1)+2.""^(n)C_(r)=

If .^(n)C_(r-1): .^(n)C_(r): .^(n)C_(r+1)=3:4:5 , find the values of n and r.

RD SHARMA ENGLISH-COMBINATIONS-All Questions
  1. If \ ^(20)C(r+1)=\ \ ^(20)C(r-1),\ t h e n\ r is equal to a. 10 b. 11 ...

    Text Solution

    |

  2. If C(n , 12)=C(n ,8),\ t h e n\ C(22 , n) is equal to a. 132 b. 210 c....

    Text Solution

    |

  3. If \ ^m C1=\ \ ^n C2 then which is correct a. 2m=n b. 2m=n(n+1) c. 2m...

    Text Solution

    |

  4. If \ ^n C(12)=\ \ ^n C8 then = a. 20 b. 12 c. 6 d. 30

    Text Solution

    |

  5. If \ ^n Cr+\ ^n C(r+1)=\ \ ^(n+1)Cx ,\ t h e n x = a. r b. r-1 c. n d...

    Text Solution

    |

  6. If \ ^(a^2-a)C2=\ \ ^(a^2-a)C4\ t h e n \ value\ of\ a\ is\ = a. 2 b....

    Text Solution

    |

  7. \ ^5C1+\ ^5C2+\ ^5C3+\ ^5C4+\ ^5C5 is equal to a 30 b. 31 c. 32 d. 33

    Text Solution

    |

  8. Total number of words formed by 2 vowels and 3 consonants taken from 4...

    Text Solution

    |

  9. There are 12 points in a plane. The number of the straight lines joini...

    Text Solution

    |

  10. There persons enter a railway compartment. If there are 5 seats vacant...

    Text Solution

    |

  11. In how many ways can a committee of 5 be made out of 6 men and 4 women...

    Text Solution

    |

  12. There are 10 points in a plane and 4 of them are collinear. The number...

    Text Solution

    |

  13. There are 13 players of cricket, out of which 4 are bowlers. In how ...

    Text Solution

    |

  14. The number of ways in which a host lady can invite for a party of 8 ou...

    Text Solution

    |

  15. How many different committees of 5 can be formed from 6 men and 4 wome...

    Text Solution

    |

  16. The number of diagonals that can be drawn by joining the vertices of a...

    Text Solution

    |

  17. If \ ^(43)C(r-6)=\ ^(43)C(3r+1)\ then the value of r is a. 12 b. 8 c....

    Text Solution

    |

  18. A lady gives a dinner party for six guests. The number of ways in whic...

    Text Solution

    |

  19. If \ ^(n+1)C3=2.\ \ ^n C2\ t h e n= 3 b. 4 c. 6 d. 5

    Text Solution

    |

  20. The number of parallelograms that can be formed form a set of four ...

    Text Solution

    |