Home
Class 12
MATHS
If A= diag (4, 2, 1) then det. A is equa...

If A= diag (4, 2, 1) then det. A is equal to :

A

0

B

7

C

8

D

None of these

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • DETERMINANTS

    MODERN PUBLICATION|Exercise EXERCISE|326 Videos
  • CONTINUITY AND DIFFERENTIABILITY

    MODERN PUBLICATION|Exercise EXERCISE|588 Videos
  • EXCLUSIVELY FOR JEE(ADVANCED)

    MODERN PUBLICATION|Exercise EXERCISE|38 Videos

Similar Questions

Explore conceptually related problems

If A= diag (3, 2, 1) then det A is equal to

If A= diag (5, 2, l) then det A is equal to :

If A = diag (d_1,d_2,d_3,….d_n) then det A is equal to

if A is a square matrix such that A^(2)=A, then det (A) is equal to

If A,B,C are three square matrices of the same order such that A= B +C, then det A is equal to

MODERN PUBLICATION-DETERMINANTS-EXERCISE
  1. If {:|(2,3),(4,5)| = |(x,3),(2x,5)|, then the value of 'x' is ………..

    Text Solution

    |

  2. The cofactor of a13 in {:|(2,-3,5),(6,0,4),(1,5,-7)| is

    Text Solution

    |

  3. If A= diag (4, 2, 1) then det. A is equal to :

    Text Solution

    |

  4. If a, b, c, are in A.P, then the determinant |[x+2,x+3,x+2a],[x+3,x+4,...

    Text Solution

    |

  5. If a1,a2,a3,……………….. are in A.P., then the value of: {:|(a1,a2,1),(a...

    Text Solution

    |

  6. The system of linear equations: 3x+y-z=2,x-z=1 and 2x+2y+az=5 has un...

    Text Solution

    |

  7. Let I denote the 3xx3 and P be a matrix obtained by rearranging the co...

    Text Solution

    |

  8. If A is matrix of order 3,such that A(adjA)=10I. Then |adjA|=

    Text Solution

    |

  9. Without expanding the determinant at any stage, prove that {:|(x+1,x+2...

    Text Solution

    |

  10. Consider the following statements: (i) If any two rows or coluns of a ...

    Text Solution

    |

  11. Let A be a square matrix all of whose entries are integers. Which on...

    Text Solution

    |

  12. Let omega ne 1 be a cube root of unity and S be the set of all non-...

    Text Solution

    |

  13. Let M and N be two 3xx3 non-singular skew-=symmetric matrices such t...

    Text Solution

    |

  14. The number of values of k which the linear equations 4x+ky+2z=0 kx...

    Text Solution

    |

  15. The number of values of k, for which the system of equations (k""+""...

    Text Solution

    |

  16. If P=[[1,alpha,3],[1,3,3],[2,4,4]] is the adjoint of a 3xx3 matrix A a...

    Text Solution

    |

  17. If {:|(x,x),(1,x)| = |(3,4),(1,2)|. Write the positive value of 'x'.

    Text Solution

    |

  18. If A is a square matrix of order 3 and |3A| = k|A|, then write the val...

    Text Solution

    |

  19. If A is a square matrix order 3 such that |adjA|=225, find |A'|.

    Text Solution

    |

  20. Prove that: |[a+b+2c,a,b],[c,b+c+2a,b],[c,a,c+a+2b]|= 2(a+b+c)^3

    Text Solution

    |