Home
Class 11
MATHS
Find the sum to n terms of a series is 7...

Find the sum to n terms of a series is `7n^2-5n`. Show that it is an AP and find the `15^th` term.

Promotional Banner

Topper's Solved these Questions

  • Relations and Functions

    MAXIMUM PUBLICATION|Exercise EXAMPLE|104 Videos

  • SETS

    MAXIMUM PUBLICATION|Exercise EXAMPLE|115 Videos

Similar Questions

Explore conceptually related problems

Find the sum of n terms of the series 7+77+777+..

Find the sum to n terms of the series whose n^(th) term is n^2+2^n

Find the sum to n terms of the series whose n^(th) term is n^3-3^n

Find the sum to n terms of the series whose n^(th) term is (2n-1)^2

Find the sum to n terms of the series: 5+55+555+………..

Find the sum to n terms of the series, 2^2+ 5^2+8^2+……..

Find the sum to n terms of this series. 1^2+3^2+5^2+……….

Find the sum to n terms of the series whose n^(th) term is 2n^3+3n^2-1

Find the sum to n terms of the series whose n^(th) term is n(n+1)(n+4)

MAXIMUM PUBLICATION-SEQUENCE AND SERIES-EXAMPLE
  1. The 7^th term of an AP is 34 and the 15^thterm is 74. Find the 40^th t...

    Text Solution

    |

  2. Find the sum of 32 terms of an AP whose third term is 1 and the 6^th t...

    Text Solution

    |

  3. Find the sum to n terms of a series is 7n^2-5n. Show that it is an AP ...

    Text Solution

    |

  4. Find three numbers in AP whose sum is -3 and whose product is 8.

    Text Solution

    |

  5. Find the three numbers in AP whose sum is 21 and product is 231.

    Text Solution

    |

  6. Find the sum of all natural numbers between 100 and 1000 which are mul...

    Text Solution

    |

  7. If the AM and GM between two numbers are 34 and 16 respectively. Find ...

    Text Solution

    |

  8. If the p^th,q^th and r^th terms of a GP are a,b,c respectively, show t...

    Text Solution

    |

  9. The sum of the first p,q,r terms of an AP are a,b,c respectively, prov...

    Text Solution

    |

  10. The ratio between the sums to n terms of two AP is 7n+1:4n+27. Find th...

    Text Solution

    |

  11. If the sum of p terms of an AP is the same as the sum of its q terms, ...

    Text Solution

    |

  12. The sum of the first two terms of a GP Is -4 and the fifth term is 4 t...

    Text Solution

    |

  13. The sum of the first two terms of a GP Is -4 and the fifth term is 4 t...

    Text Solution

    |

  14. The sum of three numbers in GP is 38 and their product is 1728. Find t...

    Text Solution

    |

  15. Find the three numbers in GP whose sum is 13 and the sum of whose squa...

    Text Solution

    |

  16. Find the sum to n terms of this series. 1times4+3times7+5times10+…….

    Text Solution

    |

  17. Find the sum to n terms of this series. 1times2^2+2times3^2+3times4^...

    Text Solution

    |

  18. Find the sum to n terms of this series. 1/(1xx2)+1/(2xx3)+1/(3xx4)+....

    Text Solution

    |

  19. Find the sum to n terms of this series. 1/(1xx2)+1/(2xx3)+1/(3xx4)+....

    Text Solution

    |

  20. Find the sum to n terms of this series. 1^2+3^2+5^2+……….

    Text Solution

    |