Home
Class 10
MATHS
The 14th term of an A.P. is twice its 8t...

The 14th term of an A.P. is twice its 8th term. If its 6th term is -8, then find the sum of its first 20 terms.

Text Solution

Verified by Experts

The correct Answer is:
`= - 340`
Promotional Banner

Topper's Solved these Questions

  • ARITHMETIC PROGRESSIONS

    EDUCART PUBLICATION|Exercise LONG ANSWER TYPE QUESTIONS|44 Videos

  • ARITHMETIC PROGRESSIONS

    EDUCART PUBLICATION|Exercise SHORT ANSWER (SA - I) TYPE QUESTIONS|46 Videos

  • AREAS RELATED TO CIRCLES

    EDUCART PUBLICATION|Exercise OBJECTIVE TYPE QUESTION (LONG ANSWER TYPE QUESTIONS) |19 Videos

  • CBSE PAPER (12 MARCH 2020)

    EDUCART PUBLICATION|Exercise Set III (Section - D)|2 Videos

Similar Questions

Explore conceptually related problems

The 14 th term of an A.P.is twice its 8 th term. If its 6th term is - 8 ,then find the sum of its first 20 terms.

The 13^(th) term of an AP is 4 times its 3^(rd) term. If its 5^(th) term is 16 then the sum of its first ten terms is

The 19th term of an AP is equal to 3 times its 6th term. If its 9th term is 19, find the AP.

The m^(th) term of an A.P. is n and n^(th) term is m its p^(th) term is

The 24th term of an AP is twice its 10th term. Show that its 72nd term is 4 times its 15th term.

It the 10^(th) term of an A. P. is 1/20 and its 20^(th) term is 1/10, then the sum of its first 200 terms is :

If the 10^(th) term of an A.P. is 1/5 and its 20^(th) term is 1/3 , then the sum of its first 150 terms is:

The first term of a GP is 27 and its 8th terms is 1/81 . Find the sum of its first 10 terms.

If sum of the 3rd and the 8th terms of an AP is 7 and the sum of the 7th and 14th terms is -3, then find the 10th term.

EDUCART PUBLICATION-ARITHMETIC PROGRESSIONS-SHORT ANSWER (SA - II) TYPE QUESTIONS
  1. How many terms of the A.P. 9, 17, 25, …..must be taken to give a sum o...

    Text Solution

    |

  2. The houses of a row are numbered from 1 to 49. Show that there is a va...

    Text Solution

    |

  3. The 14th term of an A.P. is twice its 8th term. If its 6th term is -8,...

    Text Solution

    |

  4. The digits of a positive integer, having three digits, are in A.P. and...

    Text Solution

    |

  5. Find the sum of first 24 terms of the list of numbers whose nth term ...

    Text Solution

    |

  6. Determine the AP whose third term is 16 and the 7th term exceeds the 5...

    Text Solution

    |

  7. Justify whether it is true to say that the following are the nth terms...

    Text Solution

    |

  8. Justify whether it is true to say that the following are the nth terms...

    Text Solution

    |

  9. Justify whether it is true to say that the following are the nth terms...

    Text Solution

    |

  10. Find a, b and c such that the following numbers are in AP, a, 7, b, 23...

    Text Solution

    |

  11. Determine the AP whose fifth term is 19 and the difference of the eigh...

    Text Solution

    |

  12. The sum of the first 30 terms of an A.P. is 1920. if the fourth term i...

    Text Solution

    |

  13. Which term of the sequence 20 ,\ \ 19 1/4,\ \ 18 1/2,\ \ 17 3/4,\ d...

    Text Solution

    |

  14. Find the middle term of th e A.P. 7, 13, 19, … 247.

    Text Solution

    |

  15. Split 207 into three parts such that these are in AP and the product o...

    Text Solution

    |

  16. How many numbers lie between 10 and 300, which divided by 4 leave a re...

    Text Solution

    |

  17. Find the sum of two middle terms of the AP -4/3,-1,-2/3,-1/3,...,4(1/3...

    Text Solution

    |

  18. Show that the sum of an A.P. whose first term is a, the second term is...

    Text Solution

    |

  19. The first term of an AP is -5 and the last term is 45. If the sum of t...

    Text Solution

    |

  20. If S(n) denotes the sum of first n terms of an AP, then prove that S(1...

    Text Solution

    |