Home
Class 11
MATHS
Find the sum up to n terms :n.1+(n-1).2+...

Find the sum up to n terms :n.1+(n-1).2+(n-2)3+(n-3).4+....

Promotional Banner

Topper's Solved these Questions

  • MODEL QUESTION PAPERS-SET 6

    UNITED BOOK HOUSE|Exercise EXERCISE|47 Videos

  • MODEL QUESTION PAPERS-SET 8

    UNITED BOOK HOUSE|Exercise EXERCISE|50 Videos

Similar Questions

Explore conceptually related problems

Find the sum up to n terms : 1+2/3+3/3^2+4/3^3+...

Find the sum to n terms of each of the following series : n.1 + (n-1).2+(n-2). 3+(n-3).4+…

Find the sum to n terms : (1)/(2) + (3)/(2^(2)) + (5)/(2^(3)) +…+ (2n-1)/(2^(n))

Find the sum of the series 1.n+2(n-1)+3(n-2)+.....n.1 .

Find the sum of the series upto n terms ((2n+1)/(2n-1))+3((2n+1)/(2n-1))^2+5((2n+1)/(2n-1))^3+.....

Find the sum to n terms : 1/2+3/2^2+5/2^3+...+(2n-1)/2^n

Sum of n terms of the series (2n-1)+2(2n-3)+3(2n-5)+.... is

Find the sum of 2.3+3.4+4.5+......to n terms.

Find the sum of 1/(1!(n-1)!)+1/(3!(n-3)!)+1/(5!(n-5)!)+ ...,

UNITED BOOK HOUSE-MODEL QUESTION PAPERS-SET 7-EXERCISE
  1. By mathematical induction show that 3^n>n^3when nge4. N is an integer.

    Text Solution

    |

  2. Find the co-efficient of 1/xof the expansion of (1+x)^n(1+1/x)^nwhere ...

    Text Solution

    |

  3. Find the sum up to n terms :n.1+(n-1).2+(n-2)3+(n-3).4+....

    Text Solution

    |

  4. If n(p(r-1))/a=n(pr)/b=n(p(r+1))/c,then show that b^2=a(b+c)

    Text Solution

    |

  5. Show that the four lines 2x+y+1=0,2x+y+7=0,x+2y-1=0 and x+2y+5=0 form ...

    Text Solution

    |

  6. Find the equation-of the bisector of the obtused angle between the st...

    Text Solution

    |

  7. The co-ordinate of centre and the diameter of a circle are (3, 7) and ...

    Text Solution

    |

  8. Find the ratio in which the YZ. plane divides the line segment joining...

    Text Solution

    |

  9. Evaluate :lim(xrarr0)(sqrtcosx-root(3)(cosx))/(sin^2x)

    Text Solution

    |

  10. Find, form 1st principles, the derivatives of tansqrtxwith respect to ...

    Text Solution

    |

  11. Using contrapositive method show that the following statement is true....

    Text Solution

    |

  12. Find the validity of the following biconditional Statement. A triangle...

    Text Solution

    |

  13. For any three events A. B.' C show thatP(AcupBcupC)=P(A)+P(B)+P(C)-P(A...

    Text Solution

    |

  14. The mean and SD of the scoreing marks of 100 students are 40 and 5.1 r...

    Text Solution

    |

  15. if tan (beta/2)=4 tan (alpha/2),show that tan( (beta-alpha)/2)=(3sinal...

    Text Solution

    |

  16. If xcos(theta+120^@)=y cos (theta+240^@),show that x-y=-(x+y)sqrt3tant...

    Text Solution

    |

  17. If one root is the square of another of an equationax^2+2ibx+ic=0,then...

    Text Solution

    |

  18. If the sum of 1st M terms of an AP is m. and the sum of 1st N terms is...

    Text Solution

    |

  19. Exhibit graphically the solution region of the following system of 'in...

    Text Solution

    |

  20. How many numbers can be formed with the digits 1, 2, 3, 4, 3, 2, 1 so ...

    Text Solution

    |