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The inverse of a diagonal matrix is a. a...

The inverse of a diagonal matrix is a. a diagonal matrix b. a skew symmetric matrix c. a symmetric matrix d. none of these

A

a symmetric matrix

B

a skew-symmetric matrix

C

a diagonal matrix

D

none of these

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The correct Answer is:
C
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OBJECTIVE RD SHARMA ENGLISH-MATRICES-Exercise
  1. If A and B arę square matrices of same order such that AB = A and BA =...

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  2. The inverse of an invertible symmetric matrix is a symmetric matrix.

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  3. The inverse of a diagonal matrix is a. a diagonal matrix b. a skew sym...

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  4. If A is a symmetric matrixfand n in N, then A^(n) is

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  5. If A is a skew-symmetric matrix and n is odd positive integer, then A^...

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  6. If A is a skew-symmetric matrix and n is odd positive integer, then A^...

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  7. If A is a skew-symmetric matrix and n is odd positive integer, then A^...

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  8. If A = [a(ij)] is a skew-symmetric matrix of order n, then a(ij)=

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  9. If A and B are symmetric matrices of the same order, write whether ...

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  10. If A and B are square matrices of the same order such that A B=B A ...

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  11. The trace of the matrix A=[1-5 7 0 7 9 11 8 9] is (a) 17 (b) 25 ...

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  12. If A is a skew- symmetric matrix, then trace of A is: 1.) 1 2.) -...

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  13. If {:A=[(1,x),(x^7,4y)],B=[(-3,1),(1,0)]and adjA+B=[(1,0),(0,1)]:}, th...

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  14. If A is a square matrix of order n xx n and k is a scalar, then adj (k...

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  15. If A is a singular amtrix, then adj A is

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  16. If A is a non singular square matrix; then adj(adjA) = |A|^(n-2) A

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  17. If A is a singular amtrix, then adj A is

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  18. If A=[(cosx,sinx),(-sinx,cosx)] and A.(adjA)=k[(1,0),(0,1)] then the v...

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  19. If A=[[1,1],[1,1]] ,prove that A^n=[[2^(n-1),2^(n-1)],[2^(n-1),2^(n-1)...

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  20. If A=[{:(a,b),(b,a):}] and A^(2)=[{:(alpha, beta),(beta, alpha):}] the...

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