Home
Class 11
MATHS
If the 5th and 12th terms of an A.P. are...

If the 5th and 12th terms of an A.P. are 30 and 65 respectively, what is the sum of the first 20 terms ?

Promotional Banner

Topper's Solved these Questions

  • SEQUENCES AND SERIES

    MODERN PUBLICATION|Exercise EXERCISE|435 Videos

  • RELATIONS AND FUNCTIONS

    MODERN PUBLICATION|Exercise EXERCISE|226 Videos

  • SETS

    MODERN PUBLICATION|Exercise EXERCISE|381 Videos

Similar Questions

Explore conceptually related problems

If 7th and 13th terms of an A.P. be 34 and 64 respectively, then its 18th term is:

If the 3rd and 9^(th) terms of an A.P. are 4 and - 8 respectively, which term of this A.P. is zero.

The 5th, 8th and 11th terms of a G.P. are p, q and x, respectively. Show that q^2=ps .

How many terms are there in A.P. whose first and fifth terms are -14 and 2 respectively and the sum of terms is 40 ?

If the 12th term of an A.P. is -13 and the sum of the first four terms is 24, what is the sum of the first 10 terms ?

The sum of the third and the seventh term of an A.P. is 6 and their product is 8. Find the sum of first sixteen terms of an A.P.

The 5th, 8th, and 11th terms of a GP are p, q and s respectively. Find relation between p,q and s.

If the first and fifth term of AP are 12 and 60. Find the 15th term of this AP.

Find the 10th term of A.P if a=1 , d=2

MODERN PUBLICATION-SEQUENCES AND SERIES-EXERCISE
  1. How many terms are there in A.P. whose first and fifth terms are -14 a...

    Text Solution

    |

  2. If the sum of the first n terms of a sequence is of the form An^2+ Bn,...

    Text Solution

    |

  3. If the 5th and 12th terms of an A.P. are 30 and 65 respectively, what ...

    Text Solution

    |

  4. If the first term a1 of an A.P. is 22, the common difference d = -4 an...

    Text Solution

    |

  5. In an A.P., if p^(th) term is 1/q and q^(th) term is 1/p, prove that t...

    Text Solution

    |

  6. If the sum of first p terms of an A.P. is equal to the sum of the firs...

    Text Solution

    |

  7. If ‘S’ is the sum of a finite A.P. whose first term is ‘a’ and last te...

    Text Solution

    |

  8. In an A.P., of which a is the first term, if the sum of the first p te...

    Text Solution

    |

  9. The sum of n terms of two arithmetic series are in the ratio of (7n + ...

    Text Solution

    |

  10. The sum of n terms of arithmetic progressions are in the ratio (3n+ 8)...

    Text Solution

    |

  11. The ratio of the sums of m and n terms of an A.P. is m^2: n^2. Show th...

    Text Solution

    |

  12. A man saves ₹3200 during the first year, ₹ 3600 in the next year, ₹ 40...

    Text Solution

    |

  13. A gentleman buys every year Bank’s certificates of value exceeding th...

    Text Solution

    |

  14. A gentleman buys every year Bank’s certificates of value exceeding th...

    Text Solution

    |

  15. If in an A.P. S1=6 and S7=105, prove that : S(n),S(n-3)::(n+3),(n-3)...

    Text Solution

    |

  16. In an A.P., S(3)=6 and S(6)=3 prove that: 2(2n+1)S(n+4)=(n+4)S(2n+1)...

    Text Solution

    |

  17. Let the sum of n, 2n, 3n terms of an A.P. be S1, S2 and S3, respective...

    Text Solution

    |

  18. If ‘a’ and ‘b’ are respectively the pth and qth terms of an A.P., show...

    Text Solution

    |

  19. Sum of first p,q and r terms of an A.P. are a,b,c respectively. Prove...

    Text Solution

    |

  20. Find the A.M. between : 3.7 and 5.5.

    Text Solution

    |