Matrices

Question

X, Z are matrices of order 2 x 2 X p respectively.
If n = p, then the order of the matrix 7X – 5Z is :

  • p x 2  

  • 2 x n   

  • n x 3
  • p x n

Answer

B.

2 x n   

X, Z are matrices of order 2 X n, 2 X p respectively. Also n = p. So X, Z are matrices of the same type 2 X n

∴ 7X - 5Z is defined and of type 2 X

∴ (B)    is correct answer.

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