NCERT Class 12 · Ch 3 Exercise 3.2 · Q22
NCERT Class 12 Maths · Chapter 3 Matrices · Exercise 3.2 Question 22
For X of order 2×n and Z of order 2×p with n=p, what is the order of 7X−5Z?
💡 Concept Hints
- Check the matrix orders and the meaning of the requested operation before calculating.
- Keep row and column indices in order. Compare corresponding entries only after the matrix expressions have compatible dimensions.
✅ Step-by-Step Solution
Final Answer: B: 2×n.
- Scalar multiplication does not change matrix order.
- Since n=p, X and Z have equal order 2×n, and their difference has that same order. Select B.
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