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Let A and B be two 3 × 3 non-zero real matrices such that AB is a zero matrix. Then

1. The system of linear equations AX = 0 has a unique solution
2. The system of linear equations AX = 0 has infinitely many solutions
3. B is an invertible matrix
4. adj (A) is an invertible matrix

Correct answer: The system of linear equations AX = 0 has infinitely many solutions

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