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If A and B are two matrices of the order 3 × m and 3 × n, respectively, and m = n, then the order of matrix (5A – 2B) is
  • a)
    m × 3
  • b)
    3 × 3
  • c)
    m × n
  • d)
    3 × n
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
If A and B are two matrices of the order 3 × m and 3 × n, ...
Given that, the order of matrix A is 3 × m, and the order of B is 3 × n.
Also, m = n.
So, the order of matrix A and B is the same, i.e. 3 × m.
Thus, subtraction of matrices is possible and (5A – 3B) also has the same order, i.e. 3 × n.
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