Home
Class 12
MATHS
If the sum of the first 2n terms of the ...

If the sum of the first `2n` terms of the A.P. 2, 5, 8, ..., is equal to the sum of the first `n` terms of A.P. 57, 59, 61, ..., then `n` equals `10` b. `12` c. `11` d. `13`

A

10

B

12

C

11

D

13

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • DEFINITE INTEGRATION & ITS APPLICATION

    RESONANCE ENGLISH|Exercise High Level Problem|26 Videos

  • EQUATIONS

    RESONANCE ENGLISH|Exercise EXERCISE-2 (PART-II: PREVIOUSLY ASKED QUESTION OF RMO) |5 Videos

Similar Questions

Explore conceptually related problems

Find the sum of the first 22 terms of the A.P. : 8, 3, -2,………….

The sum of the first n terms of an A.P. is 4n^2+2n . Find the n t h term of this A.P.

The sum of the first n terms of an A.P. is 3n^2+6n . Find the n^(th) term of this A.P.

The sum of first 5 terms and first 15 terms of an A.P. are equal. Find the sum of its first 20 terms.

If the sum of first p terms of an A.P. is equal to the sum of the first q terms, then find the sum of the first (p + q) terms.

If the sum of first p terms of an A.P. is equal to the sum of the first q terms, then find the sum of the first (p+q) terms.

If the sum of first n terms of an A.P. is 3n^2 + 2n , find its r^(th) term.

If the sum of first n terms of an A.P. is cn^(2) then the sum of squares of these n terms is

RESONANCE ENGLISH-DPP-QUESTION
  1. Along a road lies an odd number of stones placed at intervals of 10 m....

    Text Solution

    |

  2. First, second and sevents terms of an A.P. (all the terms are distinct...

    Text Solution

    |

  3. If the sum of the first 2n terms of the A.P. 2, 5, 8, ..., is equal to...

    Text Solution

    |

  4. Find the sum of integers from 1 to 100 that are divisible by 2 or 5...

    Text Solution

    |

  5. Sum of an infinite G.P. is 5/4 times the sum of all the odd terms. The...

    Text Solution

    |

  6. Sum of an infinitely manu terms of a G.P. is 3 times the sum of even t...

    Text Solution

    |

  7. Given x in (-1,0)uu(0,1)and f(x)= sum(n=0)^(oo) x^(n)(-1)^(n(n+1)/(2))...

    Text Solution

    |

  8. Find the value of cos""(pi)/(12)(sin""(5pi)/(12)+cos""(pi)/(4))+sin"...

    Text Solution

    |

  9. If A and B are two sets, then Ann(bar(AuuB)) is equal to :

    Text Solution

    |

  10. A survey shows that 63% of the people watch a news channel whereas ...

    Text Solution

    |

  11. If cos(alpha+beta)=0 then sin(alpha+2beta)=

    Text Solution

    |

  12. Two infinite sets have m and n elements. The number of subsets of t...

    Text Solution

    |

  13. In a certain town, 25% families own a phone and 15% own a car, 65% fam...

    Text Solution

    |

  14. If Xuu{1,2}={1,2,3,5,9}, then :

    Text Solution

    |

  15. If sqrt((1-sinA)/(1+sinA))+(sinA)/(cosA)=(1)/(cosA), for all permissib...

    Text Solution

    |

  16. Let ax^(2)+a^(2)x+2=0 be a quadratic equation, a in R and S be the set...

    Text Solution

    |

  17. Let ax^(2)+a^(2)x+2=0 be a quadratic equation, a in R and S be the set...

    Text Solution

    |

  18. The arithmaeic mean of the nine numbers in the given set {9,99,999,….....

    Text Solution

    |

  19. If a, b and c are in AP and if the equations (b-c)x^2 + (c -a)x+(a-b)=...

    Text Solution

    |

  20. Solve :(tanx-(1)/(sqrt3))(cosx-(1)/(2))le0.

    Text Solution

    |