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Illustration 3: If A and B are square matrices of equal degree, then which of the following is correct? (1995)
1. A+B = B+A 2. A+B = A-B
3. A-B = B-A 4. AB = BA
Solution:Since A and B are square matrices and are also of equal degree so the addition must be commutative.
Hence, we must have A+B = B+A.
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