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If A=[[1, 2, x], [0 ,1 ,0],[ 0, 0, 1]]...

If `A=[[1, 2, x], [0 ,1 ,0],[ 0, 0, 1]]` and `B=[[1,-2,y],[0, 1, 0 ],[0, 0, 1]]` and `A B=I_3` , then `x+y` equals (a) 0 (b) -1 (c) 2 (d) none of these

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RD SHARMA ENGLISH-ALGEBRA OF MATRICES-All Questions
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  2. If A=[(1,a),(0, 1)] , then A^n (where n in N) equals (a)[(1,n a),(0, ...

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  3. If A=[[1, 2, x], [0 ,1 ,0],[ 0, 0, 1]] and B=[[1,-2,y],[0, 1, 0 ],[0...

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  4. If A=[1-1 2-1] , B=[a1b-1] and (A+B)^2=A^2+B^2 , then values of a and ...

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  5. If A=[alphabetagamma-alpha] is such that A^2=I , then 1+alpha^2+betaga...

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  6. If S=[S(i j)] is a scalar matrix such that s(i i)=ka n dA is a square ...

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  7. If a square matrix such that A^2=A , then (I+A)^3-7A is equal to A ...

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  8. If a matrix A is both symmetric and skew-symmetric, then A is a dia...

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  9. The matrix [(0, 5,-7),(-5, 0, 11),( 7,-11, 0)] is (a) a skew-symmetr...

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  10. If A is a square matrix, then A A is a (a) skew-symmetric matrix (b)...

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  11. If A and B are symmetric matrices, then A B A is (a) symmetric m...

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  12. If A=[(5,x),( y,0)] and A=A^T , then a) x=0,\ \ y=5 (b) x+y=5 (c)...

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  13. If A is 3xx4 matrix and B is a matrix such that A^T B and B A^T are bo...

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  14. If A=[a(i j)] is a square matrix of even order such that a(i j)=i^2-...

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  15. If A=[costheta-sinthetasinthetacostheta] , then A^T+A=I2 , if theta=np...

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  16. If A=[(2, 0,-3),( 4, 3, 1),(-5, 7, 2)] is expressed as the sum of a s...

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  17. Out of the following matrices, choose that matrix which is a scalar...

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  18. The number of all possible matrices of order 3xx3 with each entry 0...

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  19. Which of the given values of x and y make the following pairs ...

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  20. If A=[(0, 2),( 3,-4)] and k A=[(0, 3a),(2b, 24)] , then the values o...

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