Home
Class 11
MATHS
Determine the number of terms in the A.P...

Determine the number of terms in the A.P.3,7,11,......,407.Also find its 20th term from the last.

Promotional Banner

Topper's Solved these Questions

  • RECTANGULAR CO-ORDINATES

    PATHFINDER|Exercise QUESTION BANK|27 Videos
  • SEQUENCES AND SERIES

    PATHFINDER|Exercise QUESTION BANK|23 Videos

Similar Questions

Explore conceptually related problems

How many terms are there in the A.P. 3, 7, 11, ... 407?

The number of terms of the A.P. 3,7,11,15… to be teken so that the sum is 406 is-

find the 10th term of the AP : 5,1,-3,-7,……

If the sum of a certain number of terms of the A.P. 25, 22, 19, … is 116. Find the last term.

Find the 20th term from the end of the AP:3, 8, 13, ..., 253.

Find the A.P. whose nth term is 7 – 3K. Also find the 20th term.

The first and last terms of an A.P. having a finite number of terms are respectively (-2) and 124 and the sum of the A.P. is 6161. Find the number of terms in the A.P. and also its common difference.

Determine the AP whose 3rd term is 5 and the 7th term is 9.

Find the sum of 20th term of the A.P (x+y), (x-y), (x-3y), ....

The nth term of an A.P. is 7n-5, find the sum of first 20 terms of the series.

PATHFINDER-SAME SPECIAL SEQUENCE-QUESTION BANK
  1. Show that the sequence loga, log(ab), log(ab^2), log(ab^3),.....is in ...

    Text Solution

    |

  2. If the m^(th) term and the n^(th) term of an A.P. are respectively (1)...

    Text Solution

    |

  3. Determine the number of terms in the A.P.3,7,11,......,407.Also find i...

    Text Solution

    |

  4. In a certain A.P the 24th term is twice the 10th term. Prove that the...

    Text Solution

    |

  5. The sum of three numbers in A.P is 12 and sum of their cubes is 288. F...

    Text Solution

    |

  6. Find the sum first 24 terms of A.P. a1,a2,a3,..........., if it is kn...

    Text Solution

    |

  7. If the P^(th)and q^(th)terms of an A.Pare a and b respectively,then sh...

    Text Solution

    |

  8. If s1 be the sum of (2n+1) terms of an A.P and s2 be the sum its odd t...

    Text Solution

    |

  9. The ratio if the sum of n terms of two A.P,s is (7n+1):(4n+27). Find t...

    Text Solution

    |

  10. If a^2, b^2, c^2 are in A.P , then prove that 1/(b+c), 1/(c+a),1/(a+b)...

    Text Solution

    |

  11. Find the sum of the following series 6+66+666+..........to n term

    Text Solution

    |

  12. If the first and the n^("th") term of a G.P. are a and b, respectivel...

    Text Solution

    |

  13. Find the equations of the lines, which cut-off intercepts on the axes ...

    Text Solution

    |

  14. If S1, S2 and S3 be respectively the sum of n, 2n and 3n terms of a G....

    Text Solution

    |

  15. If S be the sum. P be the product,and R the sum of the reciprocals of ...

    Text Solution

    |

  16. If x = 1+a+a^2+..........oo where abs(a)lt1 and y=1+b+b^2+........oowh...

    Text Solution

    |

  17. Prove that : (2^(1/4)cdot4^(1/8)cdot8^(1/16)cdot16^(1/32)......oo)=2

    Text Solution

    |

  18. Find the value of n so that (a^(n+1)+b^(n+1))/(a^(n)+b^n) may be the ...

    Text Solution

    |

  19. Insert 4 arithmetic mean between 5 and 20.

    Text Solution

    |

  20. If n is a even number, find the sum of the series upto n terms1^2-2^2+...

    Text Solution

    |