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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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