Home
Class 12
MATHS
{:("If",a = 1 + 2 + 4 + ..."to n terms")...

`{:("If",a = 1 + 2 + 4 + ..."to n terms"),(,b = 1 + 3 + 9 + ..."to n terms"),(,c =1 + 5 + 25+ ..."to n terms"):}`
then `|(a,2b,4c),(2,2,2),(2^(n),3^(n),5^(n))|=`

A

`(30)^(n)`

B

`(10)^(n)`

C

`0`

D

`2^(n)+3^(n)+5^(n)`

Text Solution

Verified by Experts

The correct Answer is:
C

`(c )` a=2^(n)-1`, `b=(3^(n-1))/(2)`, `c=(5^(n)-1)/(4)`
`:.Delta=|{:(a,2b,4c),(2,2,2),(2^(n),3^(n),5^(n)):}|`
`Delta=2*|{:(2^(n)-1,3^(n)-1,5^(n)-1),(1,1,1),(2^(n),3^(n),5^(n)):}|=0`
Promotional Banner

Topper's Solved these Questions

  • DETERMINANT

    CENGAGE|Exercise Multiple Correct Answer|5 Videos
  • DETERMINANT

    CENGAGE|Exercise Multiple Correct Answer|5 Videos
  • DEFINITE INTEGRATION

    CENGAGE|Exercise JEE Advanced Previous Year|38 Videos
  • DETERMINANTS

    CENGAGE|Exercise Question Bank|23 Videos

Similar Questions

Explore conceptually related problems

If (1.2+2.3+3.4+cdots "to n terms")/(1+2+3+cdots "to n terms") =6 find n.

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

lim_(n rarr oo) (1+3+5+7+...."n terms")/(2+4+6+8+...."n terms")= _____.

find the sum of n terms of the series (4-(1)/(n))+(4-(2)/(n))+(4-(3)/(n))+

If 3+5+9+17+33+… to n terms =2^(n+1)+n-2 , then nth term of LHS, is

Sum to n terms of the series 1^(3) - (1.5)^(3) +2^(3)-(2.5)^(3) +…. is

If the sum of n terms of an A.P. is 2n^2+5n , then its n t h term is 4n-3 (b) 3n-4 (c) 4n+3 (d) 3n+4

Find the sum of n terms of the series whose n t h term is: 2n^2-3n+5

If the n^(t h) term of an A.P. is 2n+1 , then the sum of first n terms of the A.P. is n(n-2) (b) n(n+2) (c) n(n+1) (d) n(n-1)

CENGAGE-DETERMINANT-Single correct Answer
  1. If either of the two P, Q and R are equal and P+Q+R=180^(@), then the ...

    Text Solution

    |

  2. In a triangle ABC, if a,b,c are the sides opposite to angles A, B, C r...

    Text Solution

    |

  3. {:("If",a = 1 + 2 + 4 + ..."to n terms"),(,b = 1 + 3 + 9 + ..."to n te...

    Text Solution

    |

  4. If a1, a2, a3,54,a6,a7, a8, a9 are in H.P., and D=|a1a2a3 5 4a6a7a8a9|...

    Text Solution

    |

  5. |[1/c,1/c,-(a+b)/c^2],[-(b+c)/c^2,1/a,1/a],[(-b(b+c))/(a^2c),(a+2b+c)/...

    Text Solution

    |

  6. The equation |((1+x)^2,(1-x)^2,-(2+x^2)),(2x+1,3x,1-5x),(x+1,2x,2-3x)...

    Text Solution

    |

  7. Let Delta1=[[ap^2,2ap,1],[aq^2,2aq,1],[ar^2,2ar,1]] and Delta2=[[apq,a...

    Text Solution

    |

  8. Area of triangle whose vertices are (a,a^2),(b,b^2),(c,c^2) is 1/2 . a...

    Text Solution

    |

  9. The value of |{:(betagamma,betagamma'+beta'gamma,beta'gamma'),(gammaal...

    Text Solution

    |

  10. If |{:(a,b,a),(b,c,1),(c,a,1):}|=2010 and if |{:(c-a,c-b,ab),(a-b,a-c,...

    Text Solution

    |

  11. Let |(a,l,m),(l,b,n),(m,n,c)||(bc-n^2,mn-lc,ln-bm),(mn-lc,ac-m^2,ml-an...

    Text Solution

    |

  12. The value of |{:(x^(2)+y^(2),ax+by,x+y),(ax+by,a^(2)+b^(2),a+b),(x+y,a...

    Text Solution

    |

  13. If u=ax+by+cz, v=ay+bz+cx, w=ax+bx+cy, then the value of |{:(a,b,c),(b...

    Text Solution

    |

  14. If the number of positive integral solutions of u+v+w=n be denoted by ...

    Text Solution

    |

  15. If f(x), h(x) are polynomials of degree 4 and |(f(x), g(x),h(x)),(a, b...

    Text Solution

    |

  16. If f(x)=|[x-2, (x-1)^2, x^3] , [(x-1), x^2, (x+1)^3] , [x,(x+1)^2, (x+...

    Text Solution

    |

  17. If f(x)=|{:(sinx,cosx,tanx),(x^(3),x^(2),x),(2x,1,x):}|, then lim(xto0...

    Text Solution

    |

  18. If the system of linear equations x+2ay +az =0,x+3by+bz =0 and x+4cy ...

    Text Solution

    |

  19. Find all values of lambda for which the (lambda-1)x+(3lambda+1)y+2lamb...

    Text Solution

    |

  20. The system of homogenous equations tx+(t+1)y+(t-1)z=0, (t+1)x+ty+(t+...

    Text Solution

    |